Add readme with Travis status

The current status of the master branch (passing or failing automated tests) is indicated by a badge at the top of the readme.

Author: edoddridge

README.md

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+[![Build Status](https://travis-ci.org/altMITgcm/MITgcm66h.svg?branch=master)](https://travis-ci.org/altMITgcm/MITgcm66h)
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+# MITgcm66h
+M.I.T general circulation model as of checkpoint66h with author emails