Add Makefile for development

Makefile

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+.PHONY: ci checkformat lint install run autoformat
+
+VENV_NAME?=venv
+VENV_ACTIVATE=. $(VENV_NAME)/bin/activate
+PYTHON=$(VENV_NAME)/bin/python3
+PROJECT=opendrop
+
+.DEFAULT: lint
+
+venv: $(VENV_NAME)/bin/activate
+
+$(VENV_NAME)/bin/activate: setup.py requirements-dev.txt Makefile
+	test -d $(VENV_NAME) || virtualenv -p python3 $(VENV_NAME)
+	$(PYTHON) -m pip install -U pip
+	$(PYTHON) -m pip install -r requirements-dev.txt
+	$(PYTHON) -m pip install -e .
+	touch $(VENV_NAME)/bin/activate
+
+ci: checkformat lint install
+
+checkformat:
+	$(PYTHON) -m yapf --diff -r setup.py $(PROJECT)
+
+lint: venv	
+	$(PYTHON) -m flake8 --statistics --show-source setup.py $(PROJECT)
+
+install: venv
+	$(PYTHON) -m pip install .
+
+run: install
+	$(VENV_NAME)/bin/$(PROJECT) receive
+
+autoformat: venv
+	$(PYTHON) -m yapf -i -r setup.py $(PROJECT)

requirements-dev.txt

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+flake8
+yapf

setup.cfg

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+[flake8]
+max-line-length = 127
+
+[yapf]
+based_on_style = pep8
+column_limit = 127