[WIP] Pitch Squirrel.iOS

Here's a first draft of what could the Squirrel.iOS README.

My use case is as follows:

I need to deploy an enterprise iOS application that talks to a server in the local Wi-Fi. I'd like to minimize the backwards-compatibility in both the app and the server by letting the server re-deploy the app if necessary (this may include roll-backs). Since the iOS app is not able to connect to the public internet, this rules out services like Hockey, which serves as a general example of what I am looking for.

I'd like to reuse as much of the architecture and interfaces of Squirrel.Mac as possible, but since the details may diverge significantly, having them be separate repos should be fine.