add README for accounts app

accounts/Makefile

@@ -1,4 +1,7 @@
 test:
 	@pytest --disable-pytest-warnings
 
-.PHONY: test
+fmt:
+	@black .
+
+.PHONY: test fmt

accounts/README.md

@@ -0,0 +1,37 @@
+# accounts
+
+The `accounts` app is responsible for managing operator accounts and issuing authentication tokens that will identify requests made to the `server` and the `kms` service.
+
+The application is built using the [Flask][flask-docs] framework.
+
+[flask-docs]: http://flask.pocoo.org/
+
+---
+
+## Development
+
+### Commands
+
+#### Install dependencies
+
+```
+pip install --user -r requirements.txt -r requirements-dev.txt
+```
+
+#### Run the development server
+
+```
+FLASK_APP=accounts FLASK_ENV=development flask run
+```
+
+#### Run the tests
+
+```
+make test
+```
+
+#### Auto format code using `black`
+
+```
+make fmt
+```

accounts/accounts/tests/test_status.py

@@ -2,6 +2,7 @@ import unittest
 
 from accounts import app
 
+
 class TestStatus(unittest.TestCase):
     def setUp(self):
         self.app = app.test_client()