add example1 of LED blinking

This example use the internal LED of arduino wired to 13 pin.

Signed-off-by: Zakaria ElQotbi <zakaria@derbsellicon.com>
add example2 of led control by button.

here we add an button on schema based on example1.

Signed-off-by: Zakaria ElQotbi <zakaria@derbsellicon.com>