Add AppIntentVocabulary file to intents sample

[chamons]

We were getting:

We identified one or more issues with a recent delivery for your app, "Intents Sample" 1.84821412 (1.84821412). Your delivery was successful, but you may wish to correct the following issues in your next delivery: 

ITMS-90626: Invalid Siri Support - No example phrase was provided for INRequestRideIntent in the 'en' language. Please refer to 'https://developer.apple.com/documentation/sirikit/registering_custom_vocabulary_with_sirikit/global_vocabulary_reference/intent_phrases'

ITMS-90626: Invalid Siri Support - No example phrase was provided for INListRideOptionsIntent in the 'en' language. Please refer to 'https://developer.apple.com/documentation/sirikit/registering_custom_vocabulary_with_sirikit/global_vocabulary_reference/intent_phrases'

ITMS-90626: Invalid Siri Support - No example phrase was provided for INGetRideStatusIntent in the 'en' language. Please refer to 'https://developer.apple.com/documentation/sirikit/registering_custom_vocabulary_with_sirikit/global_vocabulary_reference/intent_phrases'