additions from backlog

games/lionengine.md

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+# LionEngine
+
+_Designed for 2D Platform, Strategy and Shoot'em Up games._
+
+- Home: https://lionengine.b3dgs.com
+- State: mature
+- Download: https://lionengine.b3dgs.com/v9-0/page.php?lang=en&section=downloads
+- Platform: Windows, Linux, macOS, Android
+- Keywords: action, game engine
+- Code repository: https://github.com/b3dgs/lionengine.git
+- Code language: Java
+- Code license: GPL-3.0
+
+## Building
+