Documentation on how to create a test environment

[hluaces]

Right now testing changes for the app is quite painful because:

• There is no easy way to do it.
• Even if you deploy local services, there's no documentation on how to set up the application.
• There's also no documentation on how to set up Telegram's integration.

Ideally it should be as easy as "fill a configuration file" and "click a button" so that making changes is less painful both for new and veteran contributors.

[oscarmlage]

#28 Merged, thanks for the effort!