build: add Makefile for build tasks

Signed-off-by: Tom Carrio <tom@carrio.dev>

Makefile

@@ -0,0 +1,23 @@
+VENV = . .venv/bin/activate
+
+.venv: requirements-dev.txt
+	test -d .venv || python -m virtualenv .venv
+	$(VENV); pip install -Ur requirements-dev.txt
+
+.PHONY: test
+test: .venv
+	$(VENV); pytest
+
+.PHONY: lint
+lint: .venv
+	$(VENV); black .
+	$(VENV); flake8 .
+	$(VENV); isort .
+
+.PHONY: clean
+clean:
+	@rm -rf .venv
+	@find -iname "*.pyc" -delete
+
+.PHONY: all
+all: lint test