[TIMOB-26684] iOS: Provide example on how to use today-extensions

We would like to see a simple (classic app is enough) example on how to handle a today-extension in an own Titanium based app. It seems like it only requires some extension code and native handling, but an official example would be great to start with! References: - https://developer.apple.com/library/archive/documentation/General/Conceptual/ExtensibilityPG/Today.html Thank you!