Add documentation

[gustavi]

Hello,

I'm currently trying to add some new devices (see #13) but the absence of documentation makes things difficult. It would be perfect if some information could be added, specially :

• Rust compatible versions (1.70.0+ ?)
• How to add a new device

I'll try to write documentation when I'll successfully add a new device.

[sophiawisdom]

did you manage to figure anything out on this?

[gustavi]

Unfortunately adding devices didn't fix my problem. It seems that the problem is more to do with the API changes in the Play Store. But I've still got some notes on adding devices if anyone's interested.