[Library Manager]Please add M5Stack_SimpleBeep library

[haratta27]

Hello,
please add our library into your library manager.

Link to the repository:
https://github.com/haratta27/M5Stack_SimpleBeep

And to library.properties file:
https://github.com/haratta27/M5Stack_SimpleBeep/blob/master/library.properties

Thanks!

[cmaglie]

Done.