additions from backlog and removals because of unclear license status that could not be resolved and a bit of gitlab statistics

entries/limonengine.md

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+# LimonEngine
+
+- Home: https://github.com/enginmanap/limonEngine
+- State: beta
+- Download: https://github.com/enginmanap/limonEngine/releases
+- Platform: Windows, Linux, macOS
+- Keyword: game engine, 3D, first person, shooter
+- Code repository: https://github.com/enginmanap/limonEngine.git
+- Code language: C, C++
+- Code license: LGPL-3.0
+
+## Building
+
+- Build system: CMake