Add Ngrok example (#2328)

examples/docker-compose-ngrok.yml

@@ -0,0 +1,22 @@
+version: "3.8"
+
+services:
+  mc:
+    image: itzg/minecraft-server
+    tty: true
+    stdin_open: true
+    ports:
+      - "25565:25565"
+    environment:
+      EULA: "TRUE"
+    restart: unless-stopped
+    volumes:
+      # attach the relative directory 'data' to the container's /data path
+      - ./data:/data
+
+  ngrok:
+    image: shkoliar/ngrok:latest
+    ports:
+      - 4551:4551
+    environment:
+      - PARAMS=tcp -region=us -authtoken=YourAuthTokenHere mc:25565