Adding README.md.

README.md

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+# alphasign
+
+alphasign is a Python library for
+[Alpha American](http://www.alpha-american.com/) LED signs, such as the
+[Betabrite](http://www.betabrite.com/). It implements the
+[Alpha Communications Protocol](http://www.alpha-american.com/p-alpha-communications-protocol.html).
+
+[Read the Docs](http://readthedocs.org/docs/alphasign)
+
+![Betabrite Prisom displaying the time and temperature updated by a program using the alphasign library.](http://farm9.staticflickr.com/8010/7151560649_2d5f04955b.jpg)