Add RELEASING docs

Author: nicoddemus

CHANGELOG CHANGELOG.rstCHANGELOG renamed to CHANGELOG.rst

@@ -0,0 +1,7 @@
+Here are the steps on how to make a new release.
+
+1. Create a ``release-VERSION`` branch from ``upstream/master``.
+2. Update ``CHANGELOG.rst``.
+3. Push a branch with the changes.
+4. Once all builds pass, push a tag to ``upstream``.
+5. Merge the PR.