"I am Antoine and you, how..."
To understand what it means, you need the rest of the sentence. Here are some likely continuations and their meanings:
* "Je suis Antoine et toi comment tu t'appelles?" (I am Antoine and you, what is your name?)
* "Je suis Antoine et toi comment tu vas?" (I am Antoine and you, how are you?)
* "Je suis Antoine et toi comment tu trouves ça?" (I am Antoine and you, what do you think of this?)
Please provide the full sentence, and I can give you a more precise translation.