Add section for simulation-file creation to README.

Author: janjaali

README.md

@@ -10,5 +10,18 @@ To run the image:
 docker run -it -p 8888:8888 -p 8500:8500 -v example:/var/hoverfly/ ghashange/hoverfly:latest
 ```
 
+## Create a simulation.json
+
+The simplest and most efficient way to get a `simulation.json` covering your needs is to use hoverfly as proxy in capture-mode to extract afterwards your request-responses into a newly created awesome looking clean `simulation.json`[hoverfly-tutorial](https://hoverfly.readthedocs.io/en/latest/pages/tutorials/basic/exportingsimulations/exportingsimulations.html):
+
+```shell
+hoverctl start
+hoverctl mode capture
+curl --proxy http://localhost:8500 http://time.jsontest.com
+hoverctl export simulation.json
+```
+
+Your need to [install **hoverctl**](https://hoverfly.readthedocs.io/en/latest/pages/introduction/downloadinstallation.html) for this.
+
 [docker]: https://www.docker.com
 [hoverfly]: https://hoverfly.readthedocs.io/en/latest/