Add JWT_SECRET to .env file instructions in README

[deepakcs2003]

Contributors face issues setting up the repo because the README only mentions MONGODB_URI for the .env file, but JWT_SECRET is also needed to run the app.

Solution: Update the README to include JWT_SECRET in the .env instructions

MONGODB_URI=mongodb://localhost:27017/bloglog
JWT_SECRET=your-secret-key

Additional Context: This will help avoid setup errors and improve the onboarding process for contributors.

[github-actions]

👋 Hey there, rockstar! Thanks for dropping an issue! The BlogLog team is on it like pineapple on pizza (love it or hate it). Stick around, magic's about to happen!

[deepakcs2003]

Please assign this issue to me, as I'd like to contribute by adding JWT_SECRET to the .env setup in the README. Thanks

[sudo-dpkg]

we are no longer distributing points for doc updates, still If u want to update it, you are good to go.

[github-actions]

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