Update README.md

Author: tirthajyoti

README.md

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-# PythonNotebooks
-Practice notebooks for NumPy, Pandas, Seaborn, matplotlib, etc.
-Jupyter notebooks covering a wide range of functions and operations on the topics of NumPy, Pandans, Seaborn, matplotlib etc. 
-
+# Python Machine Learning Notebooks
 Essential codes for jump-starting machine learning/data science with Python
+### Essential tutorial-type notebooks on Pandas and Numpy
+* Jupyter notebooks covering a wide range of functions and operations on the topics of NumPy, Pandans, Seaborn, matplotlib etc.
+
+### Tutorial-type notebooks covering regression, classification, clustering, and some basic neural network algorithms
+* Simple linear regression
+* Multi-variate regression with regularization
+* Polynomial regression with how to use scikit-learn pipeline feature
+* Logistic regression/classification
+* _k_-nearest neighbor classification
+* Decision trees and Random Forest
+* Support vector machine classification
+* K-means clustering