add help info

pyatsoleiloutils/readhdf5file.py

@@ -12,13 +12,17 @@ def readmomaphdf5(
         fname
         ):
     """
+    momap_pn, s_indexes, s_array = readmomaphdf5(fname)
+
     This functions reads a given hdf5 with momentum aperture data
     saved with the function savemomaphdf5.
 
     Args:
       fname: name of the input hdf5 file
     Returns:
-
+      momap: positive and negative sides of momentum aperture
+      s_indexes: indexes where momap was calculated
+      s_array: s coordinates of s_indexes
     """
     f = h5py.File(fname, 'r')