Added Makefile for easy dev setup

This patch adds a Makefile for helping setup a dev environment
as well as running tox tests for those that aren't used to python
development.

Makefile

@@ -0,0 +1,29 @@
+.PHONY: virtual install build-requirements black isort flake8
+
+virtual: .venv/bin/pip # Creates an isolated python 3 environment
+
+.venv/bin/pip:
+	virtualenv -p /usr/bin/python3 .venv
+
+install:
+	.venv/bin/pip install -Ur requirements.txt
+
+dev: virtual
+	.venv/bin/pip install -e .
+	.venv/bin/pre-commit install
+
+test: dev
+	tox -p
+
+update-requirements: install
+	.venv/bin/pip freeze > requirements.txt
+
+.venv/bin/tox: # install tox
+	.venv/bin/pip install -U tox
+
+check: .venv/bin/tox # Code format check with isort and black
+	tox -efmt-check
+	tox -epep8
+
+fix: .venv/bin/tox # fixes code formatting with isort and black
+	tox -efmt