Created Custom Textures (markdown)

Custom-Textures.md

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+Custom textures are accepted in the form of DDS files.
+
+## What is a DDS file?
+
+DDS is a container format for GPU-native textures. The image data is ready to be uploaded to the GPU.
+
+The image data of a DDS file can use various compression methods, with some methods focusing on specific use cases.
+
+## Convert standard picture to DDS using Texpresso
+
+[Texpresso](https://github.com/jansol/texpresso) is available via Cargo:
+```bash
+cargo install texpresso_cli
+```
+
+Usage example:
+```bash
+texpresso compress --format BC3 path/to/image.png
+```
+
+The resulting .dds file can then be used with WlxOverlay-S.
+
+## Recommended Formats:
+ - `BC1`: RGB with no transparency
+ - `BC3`: Has transparency, but takes twice the memory as BC1
+ - `BC7`: Same characteristics as BC3, but higher quality (Not supported by Texpresso)