Implement CanFulfillIntentRequest

[maxbeckers]

Implement the CanFulfillIntentRequest, for more details about the request see https://developer.amazon.com/de/docs/custom-skills/understand-name-free-interaction-for-custom-skills.html#implement-canfulfillintent
For the Response in there an example: https://developer.amazon.com/de/docs/custom-skills/understand-name-free-interaction-for-custom-skills.html#canfulfillintent-sample-response