Write Django cmd for running lint (#100)

* Write Django cmd for running lint

* Respond to PR feedback

docs/developer/README.md

@@ -34,4 +34,24 @@ You can change the logging verbosity, if needed. Do a web search for "django log
 
 ## Running tests
 
-tbd.
+Crash course on Docker's `run` vs `exec`: in order to run the tests inside of a container, a container must be running. If you already have a container running, you can use `exec`. If you do not, you can use `run`, which will attempt to start one.
+
+To get a container running:
+
+```shell
+cd src
+docker-compose build
+docker-compose up -d
+```
+
+Django's test suite:
+
+```shell
+docker-compose exec app ./manage.py test
+```
+
+Linters:
+
+```shell
+docker-compose exec app ./manage.py lint
+```