java: added example BlinkOnboard based on blink_onboard.c
java: added example BlinkOnboard based on blink_onboard.c

Signed-off-by: Jakub Kramarz <9b67466f9d5df91986924f0ffd860abc78d41737@virtuslab.com>
Signed-off-by: Brendan Le Foll <3e0e8c4069934e8b47d99704927a85c66c0ceb33@intel.com>

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