Forgot to add bootstrap file for phpunit

Signed-off-by: Jesus M. Castagnetto <jesus@castagnetto.com>
Added local test/build dirs to .gitignore

Signed-off-by: Jesus M. Castagnetto <jesus@castagnetto.com>
adding comment to run composer before the example

Signed-off-by: Jesus M. Castagnetto <jesus@castagnetto.com>