docs: add texture compression script

docs/blender-texture-resolution.md

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+# Reduce Texture Resolution of a Blender File
+
+The following python script reduces the resolution of all textures in a Blender file by 50%.
+
+```python
+import bpy
+
+def resize_image(image, scale_factor=0.5):
+    # Calculate new dimensions
+    new_width = int(image.size[0] * scale_factor)
+    new_height = int(image.size[1] * scale_factor)
+
+    # Ensure the image is packed or has a file path
+    if image.packed_file:
+        image.unpack(method='USE_ORIGINAL')
+
+    # Get the file path
+    filepath = bpy.path.abspath(image.filepath)
+
+    # Skip images without a valid file path
+    if not filepath:
+        print(f"Skipping image '{image.name}' because it has no valid file path.")
+        return
+
+    # Scale the image
+    image.scale(new_width, new_height)
+
+    # Save the resized image
+    image.filepath_raw = filepath
+    image.file_format = 'PNG'  # Change format if needed
+    image.save()
+
+def main():
+    # Iterate over all images in the Blender file
+    for image in bpy.data.images:
+        if image.size[0] > 0 and image.size[1] > 0:
+            print(f"Processing image: {image.name}")
+            resize_image(image)
+
+if __name__ == "__main__":
+    main()
+```