Add automation config files

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

.coveragerc

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+[run]
+branch = True
+
+[report]
+exclude_lines =
+    \.\.\.
+    pass

.pre-commit-config.yaml

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+---
+repos:
+  - repo: https://github.com/psf/black
+    rev: 20.8b1
+    hooks:
+      - id: black
+        language_version: python3.7
+
+  - repo: https://github.com/asottile/blacken-docs
+    rev: v0.5.0
+    hooks:
+      - id: blacken-docs
+        additional_dependencies: [black==20.8b1]
+        language_version: python3.7
+
+  - repo: https://github.com/asottile/reorder_python_imports
+    rev: v2.3.5
+    hooks:
+      - id: reorder-python-imports
+        language_version: python3
+
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.0.0
+    hooks:
+      - id: end-of-file-fixer
+      - id: fix-encoding-pragma
+        args: [--remove]
+      - id: trailing-whitespace

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-docs; ## 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
+
+docs: ## Build the documentation using Sphinx
+	poetry run tox -e docs