adding new files

python/tests/test_basic_decode.py

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+from basisu_py import Transcoder
+from PIL import Image
+import numpy as np
+
+# Load input file
+with open("test.ktx2", "rb") as f:
+    data = f.read()
+
+# Decode (AUTO backend)
+t = Transcoder()
+rgba = t.decode_rgba(data)   # returns HxWx4 uint8 NumPy array
+
+print("Decoded:", rgba.shape, rgba.dtype)
+
+# Convert to Pillow Image and save
+img = Image.fromarray(rgba, mode="RGBA")
+img.save("decoded.png")
+
+print("Wrote decoded.png")