add explanation to gen_set.py

lib/obp60task/gen_set.py

@@ -1,5 +1,9 @@
 #!/usr/bin/env python3
 # A tool to generate that part of config.json  that deals with pages and fields.
+#
+#Usage: 1. modify this script (e.g.add a page, change number of fields, etc.)
+#       2. Delete all lines from config.json from the curly backet before "name": "page1type"  to o the end of the file (as of today, delete from line 917 to the end of the File)
+#       3. run ./gen_set.py >> config.json
 
 import json
 
@@ -120,5 +124,5 @@ for page_no in range(1, no_of_pages + 1):
 
 json_output = json.dumps(output, indent=4)
 # print omitting first and last line containing [ ] of JSON array
-print(json_output[1:-1])
+print(json_output[1:])
 # print(",")