Added the Read the Docs link for full documentation.

README.md

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 ```py_predpurchase``` is a package for predicting online shopper purchasing intentions, whether an online shopper will make a purchase from their current browsing session or not. This package contains functions to aid with the data analysis processes including conducting data preprocessing as well as calculating classification metrics, cross validation scores and feature importances.
 
+**Full Documentation hosted on Read the Docs**: https://py-predpurchase.readthedocs.io/en/latest/index.html
+
 ## Installation
 
 ```bash