add docker compose quick start (#80)

Author: svrnm

docs/quick-start/docker-compose.md

@@ -1,3 +1,86 @@
 # docker compose quick start
 
-to be done
+You can turn an [app sim config](../specification/README.md) into a docker compose
+file using the [docker compose generator](../../scripts/generators/docker-compose/).
+
+The generator is available as docker image and you can retrieve it by running
+
+```shell
+docker pull cisco-open/app-simulator-generators-docker-compose:latest
+```
+
+To try it out, create the a file called `config.yaml` with the following content
+in a new folder:
+
+```yaml
+services:
+  frontend:
+    type: java
+    port: 3000
+    endpoints:
+      http:
+        /upload:
+          - http://processing/magicByte
+          - http://processing/virus
+  processing:
+    type: java
+    endpoints:
+      http:
+        /magicByte:
+          - cache,128
+        /virus:
+          - http://virus-scanner/scan
+  virus-scanner:
+    type: nodejs
+    endpoints:
+      http:
+        scan:
+          - sleep,1500
+          - call: error,500,Scan failed
+            probability: 0.1
+          - sleep,500
+loaders:
+  user-1:
+    type: curl
+    wait: 0
+    sleep: 2
+    urls:
+      - http://frontend/upload
+      - http://frontend/upload
+      - http://frontend/upload
+```
+
+To generate a `docker-compose.yaml` from this file run
+
+```shell
+docker run --rm -t -i --v ${PWD}:/mnt cisco-open/app-simulator-generators-docker-compose --config /mnt/config.yaml --output /mnt/docker-compose.yaml
+```
+
+Review the `docker-compose.yaml` generated and then run the simulation via:
+
+```shell
+docker compose up
+```
+
+This will bring up the three services (`frontend`, `processing` and `virus-scanner`) and a loader (`user-1`). Run `docker ps` to verify that all
+services are up and running:
+
+```shell
+CONTAINER ID   IMAGE                                                   COMMAND                  CREATED         STATUS         PORTS                            NAMES
+aebccbe1bc54   ghcr.io/cisco-open/app-simulator-services-java:edge     "/entrypoint.sh"         4 seconds ago   Up 3 seconds   8080/tcp, 0.0.0.0:3000->80/tcp   test-app-sim-frontend-1
+75218ac52b90   ghcr.io/cisco-open/app-simulator-services-java:edge     "/entrypoint.sh"         4 seconds ago   Up 3 seconds   8080/tcp                         test-app-sim-processing-1
+75d7433f85c0   ghcr.io/cisco-open/app-simulator-services-nodejs:edge   "docker-entrypoint.s…"   4 seconds ago   Up 3 seconds   80/tcp                           test-app-sim-virus-scanner-1
+5f86a8738e15   ghcr.io/cisco-open/app-simulator-loaders-curl:edge      "/usr/bin/entrypoint…"   4 seconds ago   Up 3 seconds                                    test-app-sim-user-1-1
+```
+
+The loader will continuously load from the `/upload` endpoint. You can also reach that endpoint yourself, either by opening <http://localhost:3000/upload>
+in the browser or by running the following:
+
+```shell
+curl http://localhost:3000/upload
+```
+
+The `docker-compose.yaml` that was generated now works independent of the generator. You can use it wherever you want and you can modify it
+to your needs.
+
+If you want to learn more about app-simulator and how you can use it for your own needs, we recommend that you continue with the [tutorial](../tutorial/1-two-java-services.md).