Added background information from README.

doc/Releases.rst

@@ -0,0 +1,38 @@
+Releases Management
+###################
+
+Releases
+********
+
+r0
+==
+
+Versions
+********
+
+
+Branches
+********
+
+
+Tagging
+*******
+
+See context in `#5 <https://github.com/pyTooling/Actions/issues/5>`__.
+
+Tag new releases in the ``main`` branch using a semver compatible value, starting with ``v``:
+
+.. code-block:: bash
+
+   git checkout main
+   git tag v0.0.0
+   git push upstream v0.0.0
+
+Move the corresponding release branch (starting with ``r``) forward by creating a merge commit, and using the merged tag
+as the commit message:
+
+.. code-block:: bash
+
+   git checkout r0
+   git merge --no-ff -m 'v0.0.0' v0.0.0
+   git push upstream r0