add 'contribute' section to readme
add 'contribute' section to readme

ymero/watchdog,glorizen/watchdog,gorakhargosh/watchdog,ymero/watchdog,gorakhargosh/watchdog,glorizen/watchdog,teleyinex/watchdog,teleyinex/watchdog,mconstantin/watchdog,glorizen/watchdog,teleyinex/watchdog,ymero/watchdog,mconstantin/watchdog,mconstantin/watchdog