app to notify Mac users that someone has started sending an iMessage

hey everyone! I want to make an application for Mac OSX (desktop) which will monitor iMessage (either all contacts or specific ones) and while notify the owner of that Mac/iMessage account that this is taking place. this will happen via alert on the machine but would also like to find a way to send that alert either via SMS or some type of push notification to the users phone immediately. I will work with you on the UI as I am a designer and you can focus mainly on functionality. example: a best friend has recently gotten into a fight with another best friend. they stop talking. both are very sad and would like to know if the other is even considering speaking again. friend 1 downloads this application and installs it on their Mac and within the next 24 hours she gets a notification on her computer letting her know that friend 2 began sending her a message. friend 1 was not at her computer but was forwarded a push notification (or SMS) to her phone. friend 2 never sent the message but later friend one was able to start a conversation by saying "I saw that you were typing a message to me earlier but never sent it. want to talk?".