Add timeout property that can set up by manual. - Add `set_timeout()` to set up `self._timeout`. - Add `get_timeout()` to get `self._timeout`.   `self._timeout` is init'ed default(5000) when you're init'ing FrostAPI. _send, _recv, _write, _read can get timeout value by `get_timeout()`, when you're using them.
Add timeout property that can set up by manual.
- Add `set_timeout()` to set up `self._timeout`.
- Add `get_timeout()` to get `self._timeout`.
  `self._timeout` is init'ed default(5000) when you're init'ing FrostAPI.
_send, _recv, _write, _read can get timeout value by `get_timeout()`,
when you're using them.

cryptosan/micropython-frostapi