updated readme with yarn based set-up, removed unused imports and variables

[Abhi-m-anue]

Primary changes

• updated readme file with yarn based set-up

Other changes

• when trying to commit the updated readme file, following error came : "husky - pre-commit script failed (code 1)"
• removing some unused imports and variables , and running "yarn prettier . --write" as instructed by the error, solved the issue

[vercel[bot]]

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