Add a .gitignore file

Test: `git status` with a .vscode dir present
Change-Id: I264fcc8a6c8fab80561454aab957a53425b332f9
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1d74e21
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.vscode/