create a Makefile to ease building a release

Makefile

@@ -0,0 +1,18 @@
+clean:
+	rm README.txt
+	rm -rf ./dist ./build
+
+generate_pypi_README:
+	${VIRTUAL_ENV}/bin/pytextile README.textile | sed -e 's/^\t//' > README.txt
+
+build: generate_pypi_README
+	python -m build
+
+upload_to_test: build
+	twine check ./dist/*
+	twine upload --repository test_textile ./dist/*
+
+upload_to_prod: build
+	twine check ./dist/*
+	# for now, don't actually upload to prod PyPI, just output the command to do so.
+	@echo "twine upload --repository textile ./dist/*"