Update README.md

Author: ujjwalkarn

README.md

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-This repo contains several Python tutorials for data analysis tasks.
+This repo contains a curated list of Python tutorials for Data Science, NLP and Machine Learning.
+
+For a similar list of R tutorials for Data Science, NLP and Machine Learning, see [**this list**](https://github.com/ujjwalkarn/DataScienceR).
+
+For a comprehensive topic-wise list of machine learning and deep learning tutorials, articles and other resources, see [**this list**](https://github.com/ujjwalkarn/Machine-Learning-Tutorials/blob/master/README.md).
 
 ##Language
 - [**Dive Into Python**](http://www.diveintopython.net/index.html)