Add an option to setup a default project example using the plugin

[Maximilien-R]

It could be interesting to propose an option to the plugin's author allowing him to create a Tartiflette project using his plugin.

This would allow any future plugin user to easily and quickly test the plugin and understand how it works and how to easily integrate it into its own project.

The example Tartiflette project could be based on the tartiflette-aiohttp package and be dockerized to be easily runnable.

Could be something similar what is done on tartiflette-aiohttp examples.