Add documentation about release procedure

Co-authored-by: Marco Franssen <marco.franssen@philips.com>
Signed-off-by: Brend Smits <brend.smits@philips.com>

release.md

@@ -0,0 +1,10 @@
+# Release
+
+1. Upgrade version number in all repository files, find & replace previous version number with new version number.
+1. Commit the changed files.
+1. Tag the new commit using `git tag -sam "What is this release about?" v0.1.0`.
+
+## Experimental
+
+1. Push the tag to remote using `git push v0.1.0`
+1. Wait for the release workflow to finish, then push the main branch using `git push`