Added Text Message Sender

I rearranged the order of the toast and the sendSms. The video online
had it in that order, and I think it makes sense to have the app send
the text before we let them know that it worked.
Added an appropriate message

Not complete; I think we need to send the sendSms method a parameter
with the contact’s name, but I don’t think we have a variable yet that
specifies their name.