Create cute_png.md

docs/modules/cute_png.md

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+---
+icon: package
+label: cute_png
+---
+
+!!!
+This module is optional. Set option `PK_BUILD_MODULE_CUTE_PNG` to `ON` in your `CMakeLists.txt` to enable it.
+!!!
+
+Wraps [cute_png.h](https://github.com/RandyGaul/cute_headers/blob/master/cute_png.h) for PNG image loading and saving.
+
+#### Source code
+
+:::code source="../../include/typings/cute_png.pyi" :::