Implement Synchornous ADC API #10
Description
Implement the API for the Synchronous ADC
Documentation:
- libtock-rs overview - https://github.com/tock/libtock-rs/blob/master/doc/Overview.md
- Tock system calls - https://github.com/tock/tock/blob/master/doc/Syscalls.md
- Temperature API - https://github.com/tock/libtock-rs/tree/master/apis/temperature
- Buttons API - https://github.com/tock/libtock-rs/tree/master/apis/buttons
- microbit:v2 - https://microbit.org/new-microbit/