[Library Manager] Please add new library: Geekble_Oscillator

[SooDragon]

Would you mind add this library to library manager?
https://github.com/geekbleofficial/Geekble_Oscillator

This Library will help users to generate High frequency Pulse from 31.25KHz to 8MHz with fixed 50% duty ratio.
Thank you!

[cmaglie]

Done.

[geekbleofficial]

Thank you!