attempt to document the branches

Author: teuben

VERSIONS

@@ -37,3 +37,13 @@ ATNF miriad:    http://www.atnf.csiro.au/computing/software/miriad/
 5.x             Never released - the MIR5 branch was meant to merge the ATNF and CARMA versions
 
 6.0.0  29may20  Moved the repo from CVS to GIT, finally. 
+
+
+Branches:
+---------
+MIR3         - deprecated
+MIR4         - deprecated
+MIR5         - deprecated
+memallox     - expanded 64 bit memory allocation?
+rpfits225    - attempt to use the new RPFITS, only used by ATNF routines
+wcslib       -