Added makefile

Makefile

@@ -0,0 +1,27 @@
+.PHONY: \
+    test \
+    lint \
+    docs \
+    release \
+    clean
+
+all: lint test
+
+test:
+	pytest \
+	    --cov=gron \
+	    --cov-branch \
+	    --cov-report=term-missing
+
+lint:
+	flake8 gron
+
+#docs:
+#	$(MAKE) -C docs html
+
+release:
+	python3 setup.py sdist bdist_wheel upload
+
+clean:
+	find . -type f -name *.pyc -delete
+	find . -type d -name __pycache__ -delete