add make based minecraft server

minecraft-server/Makefile

@@ -0,0 +1,19 @@
+.PHONY: all clean
+
+all:
+	docker run \
+		--restart always \
+		--detach \
+		--name minecraft \
+		--publish 25565:25565 \
+		--env EULA=true \
+		--env DIFFICULTY=normal \
+		--env ALLOW_NETHER=true \
+		--env ANNOUNCE_PLAYER_ACHIEVEMENTS=true \
+		--env GENERATE_STRUCTURES=true \
+		--env MEMORY=2G \
+		--volume $(MC_HOME)/minecraft:/data \
+		itzg/minecraft-server
+
+clean:
+	docker ps -a | grep minecraft && docker rm -f -v minecraft || true