add Makefile for commands that are often used

Makefile

@@ -0,0 +1,16 @@
+VENV := . .venv/bin/activate &&
+
+create_venv:
+	python3 -m venv .venv
+
+create_db:
+	${VENV} python manage.py migrate
+	${VENV} echo "from django.contrib.auth import get_user_model; User = get_user_model(); User.objects.filter(is_superuser=True).exists() or User.objects.create_superuser('admin', 'admin@example.com', 'admin')" | python manage.py shell
+	if [ -f transactions.sql ]; then cat transactions.sql | sqlite3 db.sqlite3; fi
+	if [ -f exchangerates.sql ]; then cat exchangerates.sql | sqlite3 db.sqlite3; fi
+
+clean:
+	rm db.sqlite3
+
+run:
+	${VENV} python manage.py runserver 0.0.0.0:8000