Update CONTRIBUTING.md to include detailed release process steps

Author: TheAngryByrd

CONTRIBUTING.md

@@ -1 +1,16 @@
-## TODO
+## Contributing
+
+
+## Release
+
+1. Update version in CHANGELOG.md and add notes
+    1. If possible link the pull request of the changes and mention the author of the pull request
+2. Update `src.Directory.Build.props`
+3. Create new commit
+    1. `git add CHANGELOG.md`
+    1. `git commit -m "changelog for v0.45.0"`
+4. Make a new version tag (for example, `v0.45.0`)
+    1. `git tag v0.45.0`
+5. Push changes to the repo.
+    1. `git push --atomic [remote] main v0.45.0`
+        - Replace `[remote]` with your remote name, usually `origin` or `upstream`