Add ktx

ktx/external/basisu/contrib/single_file_transcoder/examples/README.md

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+# Single File Basis Universal Examples
+
+The examples `#include` the generated `basisu_transcoder.cpp` directly but work equally as well when including `basisu_transcoder.h` and compiling the amalgamated source separately.
+
+`emscripten.cpp` is a bare-bones [Emscripten](https://github.com/emscripten-core/emscripten) compiled WebGL demo picking the best transcoder format for the sample texture (see the [original PNG image](testcard.png)).
+
+The example files in this directory are released under a [Creative Commons Zero license](https://creativecommons.org/publicdomain/zero/1.0/).