Add automation config files

Add coveragerc for upcoming pytest coverage
Add pre-commit config
Add makefile for automating common processes

Makefile

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+# tox-poetry-installer makefile
+
+# You can set these variables from the command line
+PROJECT = tox_poetry_installer
+
+.PHONY: help
+# Put it first so that "make" without argument is like "make help"
+# Adapted from:
+# https://marmelab.com/blog/2016/02/29/auto-documented-makefile.html
+help: ## List Makefile targets
+	$(info Makefile documentation)
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-10s\033[0m %s\n", $$1, $$2}'
+
+tox: clean
+	tox
+
+clean-tox:
+	rm -rf ./.mypy_cache
+	rm -rf ./.tox
+	rm -f .coverage
+
+clean-py:
+	rm -rf ./dist
+	rm -rf ./build
+	rm -rf ./*.egg-info
+	rm -rf __pycache__/
+
+clean: clean-tox clean-py; ## Clean temp build/cache files and directories
+
+wheel: ## Build Python binary distribution wheel package
+	poetry build --format wheel
+
+source: ## Build Python source distribution package
+	poetry build --format sdist
+
+test: ## Run the project testsuite(s)
+	poetry run tox -r