Added README and test_chunk

python-stdlib/chunk/README.md

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+# Chunk
+
+Imported `chunk.py` from the CPython stdlib at version
+ac7b1a3f32cc81520e8962352294006d65744028.
+
+`test_chunk.py` was created as a simple test to chunkify the MicroPython logo
+(in tiff format) and ensure chunk didn't obviously fail.

python-stdlib/chunk/test/test_chunk.py

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+from chunk import Chunk
+from micropython import const
+
+logo = open("micropython-logo.tiff", "rb")
+
+CHUNK_SIZE = const(23) # Arbitrary size
+
+while True:
+    try:
+        chunk = Chunk(logo)
+    except EOFError:
+        break
+    chunktype = chunk.getname()
+    while True:
+        data = chunk.read(CHUNK_SIZE)
+        if not data:
+            break
+        print(data)