explain dev setup in README

README.md

@@ -12,6 +12,16 @@ other tools just as well.
 For development, a single `make` will install all dependencies and start
 the server. You can log in as "admin" with password "password".
 
+# Development with Castellum
+
+If you want to run the scheduler alongside castellum for development you
+need to set the following settings in castellum:
+
+```
+SCHEDULER_URL = 'http://localhost:8001'
+SCHEDULER_TOKEN = 'CHANGEME'
+```
+
 # API
 
 All API requests must send an `Authorization` header with the secret