Add docker compose demo for subql node dashboard

packages/node/docker/monitoring/README.md

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+
+# Monitoring
+
+This directory is to use prometheus and grafana to build monitoring for subql node.
+
+## Subql Node Dashboards
+
+### Bootstrap
+
+There is a docker compose file, start a subql node to index data to postgres, and use prometheus to collect indicators and grafana for visual display.
+
+To get started, run this command to launch the containers:  
+`$ docker compose up`
+
+
+Until each container is up and running, we can access the web interface of each service.
+
+-   `localhost:3000`: subql node(access the path `/metrics` to view current indicators)
+-   `localhost:5432`: is accessible for postgres connections 
+-   `localhost:9090`: prometheus web ui
+-   `localhost:3001`: grafana dashboard
+
+### View dashboard
+
+Open a browser to access `ocalhost:3001/dashboards` and select `subql-node-dashboard` to browse the monitoring indicators of subql node
+![subql node dashbard](imgs/subql-node-dashboard.png?raw=true)
+
+### License
+
+Apache-2.0

packages/node/docker/monitoring/config/db/init.sql

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+CREATE EXTENSION IF NOT EXISTS btree_gist;