examples: add minimal example to run jitsi behind traefik

examples/traefik/README.md

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+# Basic configuration to use with the traefik reverse proxy
+
+Note: Tested with traefik 1.7
+
+- When running behind traefik, it's a better practice to remove the port-binds for the web service.
+- The provided example uses an external network with the name "web". This is the network which moste likely was created while setting up traefik.
+- Look for comments starting with **#traefik:** to see the changes made in docker-compose.yml.
+
+Uncomment and set DOCKER_HOST_ADDRESS in .env. I'm pretty sure, that this is mandatory for the docker-setup and should be clearer in the original README. Could be the proxying, didn't investigate further.
+
+## TODO
+
+Add or rewrite the example with docker-compose extends
+
+````env
+DOCKER_HOST_ADDRESS=1.2.3.4
+````