Add some scaffolding.

Makefile

@@ -0,0 +1,16 @@
+.PHONY: run test docker-build docker-up docker-down
+
+run:
+	JWT_SECRET=dev-secret-change-me mvn spring-boot:run
+
+test:
+	mvn test
+
+docker-build:
+	docker build -t notesvault:latest .
+
+docker-up:
+	docker compose up -d
+
+docker-down:
+	docker compose down