[Documentation Update]: Adding importance of data cleaning and tools used for it in the readme

[shravya312]

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Issue Description

Data cleaning is one of the important part of the machine learning project

Suggested Change

During surveys there are possibillity of duplicate data.Its a waste of resources to make predictions on the same data. Sometimes Details told to fill in the survey will be left blank thats call NULL. these should be treated before starting predicted So people should be aware of data cleaning

Rationale

It help people to understand why data cleaning's important and gain insights on how to do it

Urgency

High

Record

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• [X] I'm a GSSOC contributor
• [X] I want to work on this issue
• [X] I'm willing to provide further clarification or assistance if needed.