Update README.md

Author: grburgess

README.md

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-# live_docs
-A binder with all the docs to try 3ML in real time
+# 3ML Live Documentation
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+If you want to try out all the features of 3ML before installing the code, you can run all the examples from the documentation here... live!
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+You can freely edit the code run real analysis with all the important packges of 3ML and astromodels installed. 
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+You can launch the binder here:
+[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/threeML/binder_env/master?urlpath=git-pull?repo=https://github.com/threeML/live_docs)
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