additions from backlog and osgameclones

entries/ultrastar_play.md

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+# UltraStar Play
+
+- Home: https://usplay.net/
+- Inspiration: SingStar
+- State: beta
+- Platform: Windows, Linux, macOS, Android
+- Keyword: music, remake, karaoke
+- Code repository: https://github.com/UltraStar-Deluxe/Play.git
+- Code language: C#
+- Code license: MIT
+- Code dependency: Unity
+
+## Building