Add support for `rain`

[HateHead]

Is your device already requested?

• [X] I have searched the existing issues

Brand

redmi

Name

10 c

Device code

code rain

Model

10c

Device images

No response

Do you own the device and would be willing to test the installer?

• [X] I own the device and am willing to test the installer on it.

Additional context

none

[tsterbak]

I cannot find any TWRP and custom ROM support for this device.

So I close this for now. If you think this is wrong and provide more information, we can reopen it again.