[docs] document invitecodes

docs/cli/index.rst

@@ -7,7 +7,33 @@
 
 Bitmask CLI
 ================================
-The command line interface
+``bitmaskctl`` is the command line interface.
 
-Using bitmask from the command line
+It will try to launch the bitmask backend.
+
+Creating an user
+-----------------------------------
+
+::
+
+  bitmaskctl user create user@example.org
+
+If the provider needs invite codes to register new users, you can pass one::
+  
+  bitmaskctl user create --invitecode xxxxxxx user@example.org
+
+
+Authenticating 
 -----------------------------------
+
+To authenticate, start a session and start configured services::
+
+  bitmaskctl user auth user@example.org
+
+
+Uploading logs
+---------------
+
+(This needs ``pastebinit`` installed in your system) ::
+
+  bitmaskctl logs send