reorganization

games/library/libpng.md

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+# libpng
+
+_libpng is the official PNG reference library._
+
+- Home: http://libpng.org/pub/png/libpng.html
+- Wikipedia: https://en.wikipedia.org/wiki/Libpng
+- Download: see home
+- State: mature
+- Keywords: official
+- Code: https://sourceforge.net/p/libpng/code/ci/master/tree/
+- Language(s): C
+- License: [libpng](https://sourceforge.net/p/libpng/code/ci/master/tree/LICENSE)
+
+## Building
+
+2017-12
+- On Windows CMake fails with "No CMAKE_ASM_COMPILER could be found." on "project(.. ASM)" with MSVC 2015 as generator
+