chore: update README to prefer pnpm over yarn and npm#1615

A-yushupadhyay wants to merge 3 commits intoreactplay:mainreactplay/react-play:mainfrom

A-yushupadhyay:chore/readme-update-pnpmA-yushupadhyay/react-play:chore/readme-update-pnpmCopy head branch name to clipboard