Add prometheus example

examples/prometheus/README.md

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+# Prometheus Example
+
+This example shows how you can run Flipt with a Prometheus sidecar application in Docker.
+
+!['Prometheus Example'](./prometheus.png)
+
+## Requirements
+
+To run this example application you'll need:
+
+* [Docker](https://docs.docker.com/install/)
+* [docker-compose](https://docs.docker.com/compose/install/)
+
+## Running the Example
+
+1. Run `docker-compose up` from this directory
+1. Open the Flipt UI (default: [http://localhost:8080](http://localhost:8080))
+1. Create some sample data: Flags/Segments/etc.
+1. Open the Prometheus UI (default: [http://localhost:9090/graph](http://localhost:9090/graph))
+1. Enter a sample query in the query input, ex: `grpc_server_handled_total{grpc_method="ListFlags"}` and press 'Execute'
+1. You should see a graph of requests to `ListFlags`

examples/prometheus/docker-compose.yml

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+version: "3"
+
+services:
+  prometheus:
+    image: prom/prometheus:latest
+    ports:
+      - "9090:9090"
+    volumes:
+      - "./prometheus.yml:/etc/prometheus/prometheus.yml"
+    networks:
+      - flipt_network
+
+  flipt:
+    image: markphelps/flipt:latest
+    depends_on:
+      - prometheus
+    ports:
+      - "8080:8080"
+    networks:
+      - flipt_network
+networks:
+  flipt_network:

examples/prometheus/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: 'codelab-monitor'
+
+# A scrape configuration containing exactly one endpoint to scrape:
+# Here it's Prometheus itself.
+scrape_configs:
+  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
+- job_name: 'prometheus'
+
+  # Override the global default and scrape targets from this job every 5 seconds.
+  scrape_interval: 5s
+
+  static_configs:
+    - targets: ['localhost:9090']
+
+- job_name: 'flipt'
+
+  static_configs:
+    - targets: ['flipt:8080']