Update index.md

Author: tirthajyoti

docs/index.md

@@ -87,6 +87,7 @@ Jupyter notebooks covering a wide range of functions and operations on the topic
 * How to use [Sympy package](https://www.sympy.org/en/index.html) to generate random datasets using symbolic mathematical expressions.
 
 * Here is my article on Medium on this topic: [Random regression and classification problem generation with symbolic expression](https://towardsdatascience.com/random-regression-and-classification-problem-generation-with-symbolic-expression-a4e190e37b8d)
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 ## Simple deployment examples (serving ML models on web API)