chore: add split repo templates (#2)

* chore: add split repo templates

* chore: remove blacken
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+.. Generated by synthtool. DO NOT EDIT!
+############
+Contributing
+############
+
+#. **Please sign one of the contributor license agreements below.**
+#. Fork the repo, develop and test your code changes, add docs.
+#. Make sure that your commit messages clearly describe the changes.
+#. Send a pull request. (Please Read: `Faster Pull Request Reviews`_)
+
+.. _Faster Pull Request Reviews: https://github.com/kubernetes/community/blob/master/contributors/guide/pull-requests.md#best-practices-for-faster-reviews
+
+.. contents:: Here are some guidelines for hacking on the Google Cloud Client libraries.
+
+***************
+Adding Features
+***************
+
+In order to add a feature:
+
+- The feature must be documented in both the API and narrative
+  documentation.
+
+- The feature must work fully on the following CPython versions:  2.7,
+  3.5, 3.6, and 3.7 on both UNIX and Windows.
+
+- The feature must not add unnecessary dependencies (where
+  "unnecessary" is of course subjective, but new dependencies should
+  be discussed).
+
+****************************
+Using a Development Checkout
+****************************
+
+You'll have to create a development environment using a Git checkout:
+
+- While logged into your GitHub account, navigate to the
+  ``python-api-core`` `repo`_ on GitHub.
+
+- Fork and clone the ``python-api-core`` repository to your GitHub account by
+  clicking the "Fork" button.
+
+- Clone your fork of ``python-api-core`` from your GitHub account to your local
+  computer, substituting your account username and specifying the destination
+  as ``hack-on-python-api-core``.  E.g.::
+
+   $ cd ${HOME}
+   $ git clone [email protected]:USERNAME/python-api-core.git hack-on-python-api-core
+   $ cd hack-on-python-api-core
+   # Configure remotes such that you can pull changes from the googleapis/python-api-core
+   # repository into your local repository.
+   $ git remote add upstream [email protected]:googleapis/python-api-core.git
+   # fetch and merge changes from upstream into master
+   $ git fetch upstream
+   $ git merge upstream/master
+
+Now your local repo is set up such that you will push changes to your GitHub
+repo, from which you can submit a pull request.
+
+To work on the codebase and run the tests, we recommend using ``nox``,
+but you can also use a ``virtualenv`` of your own creation.
+
+.. _repo: https://github.com/googleapis/python-api-core
+
+Using ``nox``
+=============
+
+We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
+
+- To test your changes, run unit tests with ``nox``::
+
+    $ nox -s unit-2.7
+    $ nox -s unit-3.7
+    $ ...
+
+  .. note::
+
+    The unit tests and system tests are described in the
+    ``noxfile.py`` files in each directory.
+
+.. nox: https://pypi.org/project/nox/
+
+Note on Editable Installs / Develop Mode
+========================================
+
+- As mentioned previously, using ``setuptools`` in `develop mode`_
+  or a ``pip`` `editable install`_ is not possible with this
+  library. This is because this library uses `namespace packages`_.
+  For context see `Issue #2316`_ and the relevant `PyPA issue`_.
+
+  Since ``editable`` / ``develop`` mode can't be used, packages
+  need to be installed directly. Hence your changes to the source
+  tree don't get incorporated into the **already installed**
+  package.
+
+.. _namespace packages: https://www.python.org/dev/peps/pep-0420/
+.. _Issue #2316: https://github.com/GoogleCloudPlatform/google-cloud-python/issues/2316
+.. _PyPA issue: https://github.com/pypa/packaging-problems/issues/12
+.. _develop mode: https://setuptools.readthedocs.io/en/latest/setuptools.html#development-mode
+.. _editable install: https://pip.pypa.io/en/stable/reference/pip_install/#editable-installs
+
+*****************************************
+I'm getting weird errors... Can you help?
+*****************************************
+
+If the error mentions ``Python.h`` not being found,
+install ``python-dev`` and try again.
+On Debian/Ubuntu::
+
+  $ sudo apt-get install python-dev
+
+************
+Coding Style
+************
+
+- PEP8 compliance, with exceptions defined in the linter configuration.
+  If you have ``nox`` installed, you can test that you have not introduced
+  any non-compliant code via::
+
+   $ nox -s lint
+
+- In order to make ``nox -s lint`` run faster, you can set some environment
+  variables::
+
+   export GOOGLE_CLOUD_TESTING_REMOTE="upstream"
+   export GOOGLE_CLOUD_TESTING_BRANCH="master"
+
+  By doing this, you are specifying the location of the most up-to-date
+  version of ``python-api-core``. The the suggested remote name ``upstream``
+  should point to the official ``googleapis`` checkout and the
+  the branch should be the main branch on that remote (``master``).
+
+Exceptions to PEP8:
+
+- Many unit tests use a helper method, ``_call_fut`` ("FUT" is short for
+  "Function-Under-Test"), which is PEP8-incompliant, but more readable.
+  Some also use a local variable, ``MUT`` (short for "Module-Under-Test").
+
+********************
+Running System Tests
+********************
+
+- To run system tests, you can execute::
+
+   $ nox -s system-3.7
+   $ nox -s system-2.7
+
+  .. note::
+
+      System tests are only configured to run under Python 2.7 and
+      Python 3.7. For expediency, we do not run them in older versions
+      of Python 3.
+
+  This alone will not run the tests. You'll need to change some local
+  auth settings and change some configuration in your project to
+  run all the tests.
+
+- System tests will be run against an actual project and
+  so you'll need to provide some environment variables to facilitate
+  authentication to your project:
+
+  - ``GOOGLE_APPLICATION_CREDENTIALS``: The path to a JSON key file;
+    Such a file can be downloaded directly from the developer's console by clicking
+    "Generate new JSON key". See private key
+    `docs <https://cloud.google.com/storage/docs/authentication#generating-a-private-key>`__
+    for more details.
+
+- Once you have downloaded your json keys, set the environment variable 
+  ``GOOGLE_APPLICATION_CREDENTIALS`` to the absolute path of the json file::
+
+   $ export GOOGLE_APPLICATION_CREDENTIALS="/Users/<your_username>/path/to/app_credentials.json"
+
+
+*************
+Test Coverage
+*************
+
+- The codebase *must* have 100% test statement coverage after each commit.
+  You can test coverage via ``nox -s cover``.
+
+******************************************************
+Documentation Coverage and Building HTML Documentation
+******************************************************
+
+If you fix a bug, and the bug requires an API or behavior modification, all
+documentation in this package which references that API or behavior must be
+changed to reflect the bug fix, ideally in the same commit that fixes the bug
+or adds the feature.
+
+Build the docs via:
+
+   $ nox -s docs
+
+********************************************
+Note About ``README`` as it pertains to PyPI
+********************************************
+
+The `description on PyPI`_ for the project comes directly from the
+``README``. Due to the reStructuredText (``rst``) parser used by
+PyPI, relative links which will work on GitHub (e.g. ``CONTRIBUTING.rst``
+instead of
+``https://github.com/googleapis/python-api-core/blob/master/CONTRIBUTING.rst``)
+may cause problems creating links or rendering the description.
+
+.. _description on PyPI: https://pypi.org/project/google-api-core
+
+
+*************************
+Supported Python Versions
+*************************
+
+We support:
+
+-  `Python 3.5`_
+-  `Python 3.6`_
+-  `Python 3.7`_
+
+.. _Python 3.5: https://docs.python.org/3.5/
+.. _Python 3.6: https://docs.python.org/3.6/
+.. _Python 3.7: https://docs.python.org/3.7/
+
+
+Supported versions can be found in our ``noxfile.py`` `config`_.
+
+.. _config: https://github.com/googleapis/python-api-core/blob/master/noxfile.py
+
+We explicitly decided not to support `Python 2.5`_ due to `decreased usage`_
+and lack of continuous integration `support`_.
+
+.. _Python 2.5: https://docs.python.org/2.5/
+.. _decreased usage: https://caremad.io/2013/10/a-look-at-pypi-downloads/
+.. _support: https://blog.travis-ci.com/2013-11-18-upcoming-build-environment-updates/
+
+We have `dropped 2.6`_ as a supported version as well since Python 2.6 is no
+longer supported by the core development team.
+
+Python 2.7 support is deprecated. All code changes should maintain Python 2.7 compatibility until January 1, 2020.
+
+We also explicitly decided to support Python 3 beginning with version
+3.5. Reasons for this include:
+
+-  Encouraging use of newest versions of Python 3
+-  Taking the lead of `prominent`_ open-source `projects`_
+-  `Unicode literal support`_ which allows for a cleaner codebase that
+   works in both Python 2 and Python 3
+
+.. _prominent: https://docs.djangoproject.com/en/1.9/faq/install/#what-python-version-can-i-use-with-django
+.. _projects: http://flask.pocoo.org/docs/0.10/python3/
+.. _Unicode literal support: https://www.python.org/dev/peps/pep-0414/
+.. _dropped 2.6: https://github.com/googleapis/google-cloud-python/issues/995
+
+**********
+Versioning
+**********
+
+This library follows `Semantic Versioning`_.
+
+.. _Semantic Versioning: http://semver.org/
+
+Some packages are currently in major version zero (``0.y.z``), which means that
+anything may change at any time and the public API should not be considered
+stable.
+
+******************************
+Contributor License Agreements
+******************************
+
+Before we can accept your pull requests you'll need to sign a Contributor
+License Agreement (CLA):
+
+- **If you are an individual writing original source code** and **you own the
+  intellectual property**, then you'll need to sign an
+  `individual CLA <https://developers.google.com/open-source/cla/individual>`__.
+- **If you work for a company that wants to allow you to contribute your work**,
+  then you'll need to sign a
+  `corporate CLA <https://developers.google.com/open-source/cla/corporate>`__.
+
+You can sign these electronically (just scroll to the bottom). After that,
+we'll be able to accept your pull requests.