Add README

Author: atpalmer

README.md

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+# cstring Module
+
+Alternate string representation to the built-in `str` type.
+
+* Uses C-string representation internally.
+* Memory is allocated in one continuous buffer to reduce pointer-hopping.
+* UTF-8 encoding.
+* `len` returns size in _bytes_ (not including terminating zero-byte).
+* Random access (to _bytes_, *not* Unicode code points) is supported with indices and slices.
+
+## TODO
+
+* Write docs (see `str` type docs)
+* Write docstrings
+* Fill out setup.py
+* Implement repr
+* Implement iter (iterate over Unicode code points, "runes")
+* Implement str methods
+* Implement buffer interface?
+* Decide subclassing protocol