Create release-procedure.md

Author: LeftofZen

release-procedure.md

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+1. Switch to `master`
+1. Update `version.txt` and the `AssemblyVersion` tag in `Gui.csproj`
+1. Add, commit, push these changes
+1. `git tag -a 'x.x.x'`, where the x's are the new version number
+1. `git push --tags`
+1. Locally in Visual Studio, create a release build, and zip up the folder created
+1. In GitHub, create a new release from that tag
+1. On that release page, add the zip folder as the build artefact