Added showcase file

showcase.md

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+# Showcase
+I've created this file because I love to see what people create using this plugin ;)
+
+If you like to add your game in this list open an issue or send me a pull request with the link and title of your published game.
+
+## List of Published Games using this Plugin
+- [12345 Rotors - Puzzle Game](https://play.google.com/store/apps/details?id=com.ross.numbergame12345)
+- [Help Luigi!](https://play.google.com/store/apps/details?id=com.bananaonfire.helpluigi)
+- [SLID - Letter Sliding Puzzle](https://play.google.com/store/apps/details?id=com.kamofa.slid)
+- [iDrink – Drinking Game 🍻](https://play.google.com/store/apps/details?id=com.garfsapps.umgole)
+- [Walls of Stone - Puzzle Game](https://play.google.com/store/apps/details?id=dev.mintstudios.wos)
+- [Future Funk Soccer Racing](https://play.google.com/store/apps/details?id=org.godotengine.cargame)