message: Update docker-compose.md
  indicate that we have a lot of files for more complex setups
diff: # Quick Start with docker-compose
  -Environment variables documentation - [see usage](README.md#env_variables)
  +Environment variables documentation - [see usage](README.md#env_variables).<br/>
  +We have plenty of example files with more complex configurations. Please check them out in ``docker`` directory.
  * Add a new service in docker-compose.yml
  