Add Readme to explain this fork

README.md

@@ -0,0 +1,15 @@
+# OpenCraft fork of edx-platform
+
+This is OpenCraft's fork of https://github.com/edx/edx-platform
+
+We push branches here that are used for pull requests against
+the upstream edx-platform repository or other forks.
+
+This fork also holds the opencraft-release branches of edx-platform
+which may contain backported fixes for compatibility with
+[Ocim](https://github.com/open-craft/opencraft).
+
+The **master** branch of this repository is meaningless - do not
+refer to it nor use it as a base branch for changes to edx-platform.
+Always use the edx/edx-platform master branch as a
+starting point, or whatever other branch is appropriate.