Add some links to crism

datasets/MRO/CRISM/README.md

@@ -33,3 +33,13 @@ CRISM archive files server, with archive volumes under it, is at:
 * MTRDR: https://pds-geosciences.wustl.edu/mro/mro-m-crism-5-rdr-mptargeted-v1/
 * MRDR: https://pds-geosciences.wustl.edu/mro/mro-m-crism-5-rdr-multispectral-v1/
 
+## MRO / CRISM
+[MRO CRISM]: https://pds-geosciences.wustl.edu/missions/mro/default.htm
+[PDS Geosciences Node]: https://pds-geosciences.wustl.edu/missions/mro/crism.htm
+[Data Product Software Interface Specification]: MRO/CRISM/crism_dpsis.pdf
+
+We start at the [PDS Geosciences Node] page for [MRO CRISM] data access.
+
+First thing to cover is the [Data Product Software Interface Specification].
+
+