chore: create docker-compose for the simple example

examples/simple/README.md

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+# Simple Example
+
+The simple example exists to show how Gobblr works.
+
+- `data`: the data that will be ingested to the database.
+- `migrations`: a [GORM migration](https://gorm.io/docs/migration.html) script to build the SQL databases - this will be handled by your database library (which may or may not be GORM).
+
+You can use [Docker Compose](https://docs.docker.com/compose) to run the example stack:
+
+```shell
+docker-compose run --rm --service-ports gobblr-<db-type>
+```

examples/simple/docker-compose.yml

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+services:
+  ## MongoDB
+  gobblr-mongodb: &gobblr
+    build:
+      context: ../..
+    ports:
+      - 3000:5670
+    environment:
+      GOBBLR_CONNECTION_URI: mongodb://mongodb:27017/gobblr
+      GOBBLR_DATABASE: gobblr
+      GOBBLR_PATH: /data
+    links:
+      - mongodb
+    volumes:
+      - ./data:/data
+    restart: on-failure
+    command: db mongodb --run
+
+  mongodb:
+    image: library/mongo
+    ports:
+      - 4000:27017