Added a README

README.rst

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+.. image:: https://travis-ci.org/agronholm/hyperio.svg?branch=master
+ :target: https://travis-ci.org/agronholm/hyperio
+ :alt: Build Status
+
+HyperIO is a asynchronous compatibility API that allows applications and libraries written against
+it to run unmodified on asyncio_, curio_ and trio_.
+
+It bridges the following functionality:
+
+* Task groups
+* Cancellation
+* Threads
+* Synchronization primitives (locks, conditions, events, semaphores, queues)
+* High level networking (TCP, UDP and UNIX sockets)
+
+.. _asyncio: https://docs.python.org/3/library/asyncio.html
+.. _curio: https://github.com/dabeaz/curio
+.. _trio: https://github.com/python-trio/trio