MSTG Playground Release

Want more training apps? We hear you! We just released the MSTG-Android-Java & MSTG-Android-Kotlin for Android and the MSTG-JWT app for iOS. Come and check it out at the release page! With special thanks to Sven Schleier (@sushi2k), Wen Bin Kong (@kongwenbin), Nikhil Soni (@nikhil), and Ryan Teoh (@ryantzj).