Add Makefile and added black to Makefile

Author: PatrickSampaioUSP

Makefile

@@ -0,0 +1,17 @@
+test:
+	pytest tests -vv
+
+tests: 
+	test
+
+coverage: 
+	pytest --cov=rocketpy tests -vv
+
+install: 
+	python -m pip install --upgrade pip
+	pip install -r requirements.txt
+	python setup.py install
+
+lint:
+	black rocketpy
+	black tests

requirements_test.txt

@@ -1,2 +1,3 @@
 pytest==6.2.4
 pytest-coverage
+black