Update load_markers.py

Author: ktroule

sctools/tools/load_markers.py

@@ -2,6 +2,21 @@
 import pandas as pd
 
 def load_markers(cell = None, group = None, tech = None, tissue = None, group_cols = 'Cell'):
+    '''
+    To fill-
+    
+    mrk_df, mrk_dct = load_markers()
+    
+    Parameters:
+        - cell (list): .
+        - group (list): .
+        - tech (list): .
+        - tissue (list): .
+        - group_cols (list): .
+    Output:
+        - Data frame.
+        - Dictionary of markers.
+    '''
 
     # -- Read markers csv file
     my_resources = importlib_resources.files("sctools.tools") / "src"