additions from backlog and osgameclones

entries/cafu_engine.md

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+# Cafu Engine
+
+- Home: https://www.cafu.de/
+- State: beta, inactive since 2018
+- Keyword: game engine, 3D
+- Code repository: https://bitbucket.org/cafu/cafu.git
+- Code language: C++
+- Code license: MIT
+
+Changed license from GPL to MIT (usually only possible with consent of all authors).
+
+## Building
+
+- Build system: CMake