add README file

Author: tusharsinghsoam

README.md

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+## About
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+* This repository contains projects solved using **Classical Machine Learning Models** (e.g. Decision Trees, Logistic Regression, SVMs, XGBoost, Random Forest etc.). 
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+* Aim of this repository is to learn **Exploratory Data Analysis**, Data pre-processing and ML models available in scikit-learn.
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+* Dataset source is mentioned in the README files of individual projects
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+Feel free to collaborate or suggest any interesting project/Dataset.
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