Add link to new Sample Assets website #234
Description
The readme for https://github.com/KhronosGroup/glTF-Sample-Assets/ should probably include a prominent link to the new website https://github.khronos.org/glTF-Assets/
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The readme for https://github.com/KhronosGroup/glTF-Sample-Assets/ should probably include a prominent link to the new website https://github.khronos.org/glTF-Assets/