Added first version of watchdog
Added first version of watchdog

This is a very limited, not configurable version of the watchdog.
All it does is keep a thead consuming robot listener interface
messages. All messages are reported as JSON to a HTTP endpoint.

Future improvements include:
- Add configuration options;
- Implement unit tests;
- Improve thread handling;
- Adde more ways of sending data;
- Other.

vkruoso/robot-watchdog