Insert architecture image

Signed-off-by: albertteoh <[email protected]>

docker-compose/monitor/README.md

@@ -9,6 +9,8 @@ This environment consists four backend components:
 - [OpenTelemetry Collector](https://opentelemetry.io/docs/collector/): vendor agnostic integration layer for traces and metrics. Its main role in this particular development environment is to receive Jaeger spans, forward these spans untouched to Jaeger All-in-one while simultaneously aggregating metrics out of this span data. To learn more about span metrics aggregation, please refer to the [spanmetrics processor documentation](https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/processor/spanmetricsprocessor).
 - [Prometheus](https://prometheus.io/): a metrics collection and query engine, used to scrape metrics computed by OpenTelemetry Collector, and presents an API for Jaeger All-in-one to query these metrics.
 
+![ATMDev (1)](https://user-images.githubusercontent.com/26584478/127763924-4ae2ce88-8fc2-4def-90c2-55358a433905.png)
+
 # Getting Started
 
 ## Bring up/down the dev environment