$oauth action

There's an undocumented $oauth action on iOS. https://github.com/Jasonette/JASONETTE-iOS/blob/develop/app/Jasonette/JasonOauthAction.m

The reason it's undocumented was because I wasn't sure how long it would take to build the Android version so wanted to get rid of complexity back when i was about to release the iOS version as open source.

The decision was to exclude oauth from the documentation so it's not supported officially, until I release the initial version of Android.

But now that we have both iOS and Android out there, it would be great if we can implement $oauth on Android as well and also document this.

Read the existing iOS implementation in app/Jasonette/JasonOauthAction.m, then inspect the Android action structure to determine where the equivalent belongs. Implement $oauth for Android and update the project documentation to describe the action once both platforms support it.

Written by the indexing model from the issue text.