Simple documentation of release process

Author: hoijnet

docs/release_process.md

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+# Releasing a new version of the client
+
+1. Review the changelog between last tagged release v10.0.34..HEAD
+1. Create a branch and update RELEASE_NOTES.md based on changes
+1. Add target version number to release notes
+1. Check in and merge
+1. Pick the latest version from the RELEASE_NOTES.md file
+1. Tag the repo locally and push the tag, align the release (git tag -s v11.x.x)
+1. The new release will be built and published 🎉