add --format/-f(changes 2nd step)

Author: ttehasi

gendiff/scripts/__pycache__/gendiff.cpython-312.pyc

@@ -8,6 +8,7 @@ def main():
         )
     parser.add_argument('first_file')
     parser.add_argument('second_file')
+    parser.add_argument('-f', '--format', help='set format of output')
     print(parser.parse_args())