feat: add mobile platform build support

[Johnosezele]

Add build scripts and documentation for iOS and Android mobile platforms. Closes #3

[reez]

Thanks!

I know we don't have sample app yet, but did you happen to you run through this end-to-end (i.e. generated bindings, built the iOS/Android artifacts, and plugged them into a demo app)? Just trying to think about all the ways to double check that what we're doing here w the new scripts/locations match what an app project expects. I'm trying to double check it myself and running into issues, for example running ./scripts/build-android.sh currently fails immediately and such.

[reez]

@Aniket-pd are you interested in reviewing/testing this?

[Johnosezele]

... and plugged them into a demo app

Not yet. Though the outputs land in the directories a flutter module will expect... I shall test with the existing demo we have.

... for example running ./scripts/build-android.sh currently fails immediately and such

Oh yeah, you'd have to make the script executable or just run bash ./scripts/build-android.sh ... I think this wasn't properly formatted on the readme, I shall do that