Document the use of the package

[QuentinDaveau]

There is currently little to no documentation on how to use the package. It would be great to have at least a short explanation of how it works and how to use it. A small, simple test scene would also be great so the users have a working example to rely on.

[QuentinDaveau]

I actually made a small sample scene. It can be found here:
https://github.com/QuentinDaveau/ConnectToMySql_sample_scene