added information about release process

Author: xrotwang

RELEASING.md

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+
+Releasing an edition of CSD
+===========================
+
+1. Make sure all tests pass.
+2. Freeze the database (on the local machine).
+3. Push all local changes to the GitHub repos.
+4. Create the downloads (on the local machine).
+5. Deploy to production.
+6. Copy the downloads to production.
+7. Create a release of the git repos.
+
+-