adding new files

python/tests/test_basic_transcode.py

@@ -0,0 +1,10 @@
+from basisu_py import Transcoder
+
+with open("test.ktx2", "rb") as f:
+    data = f.read()
+
+t = Transcoder()    # AUTO backend
+img = t.decode_rgba(data)
+
+print("Decoded shape:", img.shape)
+print("dtype:", img.dtype)