Add documentation for the release process

RELEASE_CHECKLIST.md

@@ -0,0 +1,13 @@
+# Release checklist
+
+The following steps are required for a release:
+
+1. update the `Changelog` file
+2. execute the following commands:
+```shell
+new_version=2.0.0
+echo "$new_version" >VERSION
+git commit -m "Release $new_version" VERSION Changelog
+git tag -s "$new_version" -m "$new_version"
+make dist
+```