add Makefile

Makefile

+flake8:
+	flake8 --doctest papersurfer/*.py
+
+pylint:
+	pylint papersurfer/*.py
+
+pycodestyle:
+	pycodestyle papersurfer/*
+
+pydocstyle:
+	pydocstyle papersurfer/*
+
+pip-prepare:
+	- rm -r dist
+	python setup.py sdist bdist_wheel
+	tar tzf dist/papersurfer*.tar.gz
+	twine check dist/*
+	
+pip-test: pip-prepare
+	twine upload --repository-url https://test.pypi.org/legacy/ dist/*
+
+pip: pip-prepare
+	twine upload dist/*
+	
+lint: flake8 pylint pycodestyle pydocstyle
+
+test:
+	python -m pytest --doctest-modules
+
+coverage:
+	python -m pytest --doctest-modules --cov=papersurfer