Admin sends a messagae on account creation

client/user_interface.py

@@ -95,9 +95,15 @@ class SubRosaUI:
 def main():
     from argparse import ArgumentParser
     parser = ArgumentParser()
-    parser.add_argument("username")
-    parser.add_argument("-k", "--key", default="subrosa_private_key.pem")
-    parser.add_argument("-s", "--server-url", default="http://127.0.0.1:5000")
+    parser.add_argument("username", help="Existing or new username.")
+    parser.add_argument("-k", "--key", 
+        default="subrosa_private_key.pem", 
+        help="Private key file. Will be created if it does not exist."
+    )
+    parser.add_argument("-s", "--server-url", 
+        default="http://subrosa.makingwithcode.org",
+        help='Server URL. Use "http://127.0.0.1:5000" for a local server.'
+    )
     args = parser.parse_args()
     ui = SubRosaUI(args.key, args.server_url)
     ui.run(args.username)