Set up for inclusion in main docs

README.rst

-csppfetch Introduction
-----------------------
+csppfetch
+=========
 
 csppfetch is a Python 3 module for downloading dynamic ancillary data. It can:
 
 - Maintain a local cache of ancillary data 
+
 - Download the specific ancillary data files needed to process a given time step
-    - Using the local cache if available
-    - Optionally updating the local cache
+
+  - Using the local cache if available
+  - Optionally updating the local cache
 
 Final files in the cache are atomically created; from the perspective of other
 programs a given ancillary data file either completely exists or doesn't exist