moved the entries up one folder, added the folder to the keywords

games/doxygen.md

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+# Doxygen
+
+_Tool for generating documentation from annotated C++ sources._
+
+- Home: http://www.stack.nl/~dimitri/doxygen/
+- Media: https://en.wikipedia.org/wiki/Doxygen
+- State: mature
+- Download: http://www.stack.nl/~dimitri/doxygen/download.html
+- Keywords: library, source documentation generator, tool
+- Code repository: https://github.com/doxygen/doxygen.git
+- Code language: C++
+- Code license: GPL-2.0
+
+## Building
+
+- Build system: CMake
+