Add README with TODO's

README

+TODO
+====
+
+Class lists should be presented better. They should also
+preferably link to their respective source code, for ease
+of editing, along with their hiera data.
+
+To figure out:
+- what is r10k and what does it actually do
+- which data is sourced by the classes
+  - does it all come from Hiera?
+  - What are Hiera's data sources?
+