Add license files not present in the downloaded crates

The Apache-2.0 and MIT licenses found here are from:

https://github.com/awslabs/mls-rs/blob/main/LICENSE-apache
https://github.com/awslabs/mls-rs/blob/main/LICENSE-mit


---
 LICENSE-apache | 176 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 LICENSE-mit    |   9 +++
 2 files changed, 185 insertions(+)

diff --git b/LICENSE-apache a/LICENSE-apache
new file mode 100644
index 00000000..831fbc53
--- /dev/null
+++ a/LICENSE-apache
@@ -0,0 +1,176 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
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diff --git b/LICENSE-mit a/LICENSE-mit
new file mode 100644
index 00000000..e547c4ae
--- /dev/null
+++ a/LICENSE-mit
@@ -0,0 +1,9 @@
+MIT License
+
+Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including  without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to  the following conditions:
+
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