adding new files

python/tests/test_transcoder_astc.py

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+from basisu_py import Transcoder
+from astc_writer import write_astc_file
+
+# Load a .ktx2
+data = open("input.ktx2", "rb").read()
+t = Transcoder()
+
+# Transcode to ASTC
+h = t.open(data)
+bw = t.get_block_width(h)   # or basis_get_block_width(astc_tfmt)
+bh = t.get_block_height(h)
+tfmt = t.basis_get_transcoder_texture_format_from_basis_tex_format(
+    t.get_basis_tex_format(h)
+)
+
+blocks = t.transcode_tfmt(data, tfmt)
+write_astc_file("output.astc", blocks, bw, bh, t.get_width(h), t.get_height(h))
+t.close(h)