Refactor setup and add Makefile

Makefile

@@ -0,0 +1,39 @@
+SHELL := /bin/bash
+.DEFAULT_GOAL := help
+.PHONY: coverage deps help lint push test
+
+coverage:  ## Run tests with coverage
+	coverage erase
+	coverage run -m unittest -v stree.tests
+	coverage report -m
+
+deps:  ## Install dependencies
+	pip install -r requirements.txt
+
+lint:  ## Lint and static-check
+	black stree
+	flake8 stree
+	mypy stree
+
+push:  ## Push code with tags
+	git push && git push --tags
+
+test:  ## Run tests
+	python -m unittest -v stree.tests
+
+help: ## Show help message
+	@IFS=$$'\n' ; \
+	help_lines=(`fgrep -h "##" $(MAKEFILE_LIST) | fgrep -v fgrep | sed -e 's/\\$$//' | sed -e 's/##/:/'`); \
+	printf "%s\n\n" "Usage: make [task]"; \
+	printf "%-20s %s\n" "task" "help" ; \
+	printf "%-20s %s\n" "------" "----" ; \
+	for help_line in $${help_lines[@]}; do \
+		IFS=$$':' ; \
+		help_split=($$help_line) ; \
+		help_command=`echo $${help_split[0]} | sed -e 's/^ *//' -e 's/ *$$//'` ; \
+		help_info=`echo $${help_split[2]} | sed -e 's/^ *//' -e 's/ *$$//'` ; \
+		printf '\033[36m'; \
+		printf "%-20s %s" $$help_command ; \
+		printf '\033[0m'; \
+		printf "%s\n" $$help_info; \
+	done