Add README.rst

Author: Expertcoderz

README.rst

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+===============
+python-userland
+===============
+
+python-userland is a cross-platform implementation of various UNIX and Linux
+utilities, written purely in Python 3. It aims to eventually achieve feature
+parity with well-known projects such as GNU coreutils.
+
+Source files are located under the `src/`; for portability, each of them is a
+standalone Python executable that relies only on a Python interpreter and
+standard library. No third-party libraries are (currently) used.
+
+Note that this project is a work-in-progress. Not many utilities have been
+finished, and existing utilities may be limited in functionality, performance
+and correctness.
+
+Compatibility with Other Implementations
+========================================
+
+Currently undecided.
+
+Platform Support
+================
+
+python-userland should, in principle, run on any OS that runs Python. However,
+much testing has only been done in a Linux environment. This will hopefully
+change in the future.
+
+License
+=======
+
+python-userland is licensed under the GPL. See the LICENSE file for more
+information.