Merge #120

120: Add example that periodically shows the current clock ticks. r=torfmaster a=gendx

This example sets a periodic timer, and reads the current clock ticks every time it fires. This can be helpful to debug when the system ticks wrap around.

Co-authored-by: Guillaume Endignoux <guillaumee@google.com>
Co-authored-by: torfmaster <briefe@kebes.de>