Full stack Docker Compose demo with Grafana dashboard

Add a full stack demo using Docker Compose that runs Rest Server,
Prometheus and Grafana with a Rest Server dashboard.

examples/compose-with-grafana/README.md

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+# Rest Server Grafana Dashboard
+
+This is a demo [Docker Compose](https://docs.docker.com/compose/) setup for
+[Rest Server](https://github.com/restic/rest-server)
+with [Prometheus](https://github.com/restic/rest-server)
+and [Grafana](https://grafana.com/).
+
+![Grafana dashboard screenshot](screenshot.png)
+
+## Quickstart
+
+Build `rest-server` in Docker:
+
+    cd ../..
+    make docker_build
+    cd -
+
+Bring up the Docker Compose stack:
+
+    docker-compose build
+    docker-compose up -d
+
+Check if everything is up and running:
+
+    docker-compose ps
+
+Grafana will be running on [http://localhost:8030/](http://localhost:8030/)
+with username "admin" and password "admin".  The first time you access it
+you will be asked to setup a data source. Configure it like this (make sure
+you name it "prometheus", as this is hardcoded in the example dashboard):
+
+![Add data source](datasource.png)
+
+The Rest Server dashoard can be accessed 
+[here](http://localhost:8030/dashboard/file/rest-server.json).
+
+Prometheus can be accessed on [http://localhost:8020/](http://localhost:8020/).
+
+If you do a backup like this, some graphs should show up:
+
+    restic -r rest:http://127.0.0.1:8010/demo1 -p ./demo-passwd init
+    restic -r rest:http://127.0.0.1:8010/demo1 -p ./demo-passwd backup .
+