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/prometheus.yml

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+global:
+  scrape_interval:     15s # By default, scrape targets every 15 seconds.
+
+  # Attach these labels to any time series or alerts when communicating with
+  # external systems (federation, remote storage, Alertmanager).
+  external_labels:
+    monitor: 'restic-rest-server-demo'
+
+scrape_configs:
+  - job_name: 'prometheus' # monitor self
+    scrape_interval: 5s
+    static_configs:
+      - targets: ['localhost:9090']
+  
+  - job_name: 'rest_server'
+    scrape_interval: 5s
+    # Uncomment these if you use auth and/or https
+    #basic_auth:
+    #  username: test
+    #  password: test
+    #scheme: https
+    static_configs:
+      - targets: ['restserver:8000']