Adding validate text ad example. (#230)
Adding validate text ad example. (#230)

* Adding validate text ad example.

Change-Id: Ic2a8fca829bc6f393abebd609cf60427ecc74fd7

* Fixing copyright year.

Change-Id: I0e51d3e06d36004e092f87e86cb1d55b4d45a466
googleads/google-ads-ruby,googleads/google-ads-ruby,googleads/google-ads-ruby