Extend readme

README.md

@@ -1,3 +1,23 @@
 # FieldPOC
 
 A simple to use, good enough phone system for medium sized DECT networks.
+
+## Development setup
+
+Make sure you have [mitel_ommclient2]() in your Python modules path.
+
+Add user credentials to your OMM to `fieldpoc_config.json`.
+
+Edit `fieldpoc_extensions.json` to meet your preferences.
+
+Start FieldPOC:
+
+```
+python -m fieldpoc.run
+```
+
+List some options:
+
+```
+python -m fieldpoc.run --help
+```