Add more notes about local settings

README.md

@@ -9,6 +9,12 @@ $ source env/bin/activate
 (env) $ pip install -r requirements.txt
 ```
 
+## Local settings
+You'll need to copy the `app/local_settings.example.py` file to `app/local_settings.py`. The project won't start otherwise.
+```
+$ cp app/local_settings.example.py app/local_settings.py
+```
+
 ## Running database migrations
 Now we need to run the database migrations in order to get a working database.
 ```shell