adding file describing the release process

RELEASE.rst

@@ -0,0 +1,19 @@
+catkin_pip release process
+==========================
+
+1) Check travis builds are passing
+
+2) `catkin_generate_changelog`
+
+3) git commit -m "updating changelog"
+
+4) `catkin_prepare_release` and optionally bump minor (or major)
+
+5) Double check travis builds are passing
+
+6) `bloom-release` to all the supported ROS distros
+
+7) There is no check enabled on the release repo, since it is just a copy of the source repo.
+
+8) Done ! You can start to use the new version (dont forget to configure your apt to get packages from ros-shadow-fixed)
+