add note about adding commands for development

README.md

@@ -47,3 +47,7 @@ There are 2 modules in this repo:
 - `admin` - management commands
 
 To use them, ensure you're in the virtualenv and run `python3 -m tipbot` or `python3 -m admin`
+
+## Development
+
+To add more commands, create a new Python file under [tipbot/commands](tipbot/commands); copy another one for an example. Add another import for the command function in [tipbot/commands/__init__.py](tipbot/commands/__init__.py) and add the command to the `all_commands` dictionary in the same file.