Update README

Author: nil1729

README.md

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 - 1st Step [(Basic Login System, how it works)](https://github.com/nil1729/NodeJS-Authentication/tree/master/login-basic).
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 - 2nd Step [(Passport basic using `passport-local` Strategy, how to secure a route in REST APIs)](https://github.com/nil1729/NodeJS-Authentication/tree/master/passport-basic).
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 - 3rd Step [(Passport Setup and error handling)](https://github.com/nil1729/NodeJS-Authentication/tree/master/UI-setup).
-- 4th Step [(JWT Authentication and how it works)](https://github.com/nil1729/NodeJS-Authentication/tree/master/jwt-auth).
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+- 4th Step [(JWT Authentication and how it works)](https://github.com/nil1729/NodeJS-Authentication/tree/master/jwt-auth). This setup is useful for SPA. This setup is implemented with a ReactJS Project and code will be found [here](https://github.com/nil1729/React-noob/tree/master/jwt-authentication).
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 - 5th Step [(Passport Authentication using `Google oAuth`)](https://github.com/nil1729/NodeJS-Authentication/tree/master/passport-oauth-google).
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 - 6th Step [(Passport Authentication by Email Confirmation using `nodemailer` and `passport-local` Strategy)](https://github.com/nil1729/NodeJS-Authentication/tree/master/confirm-email).
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 - 7th Step [(Email Verifiaction via OTP using `speakeasy` module and JWT)](https://github.com/nil1729/NodeJS-Authentication/tree/master/otp-speakeasy).
 
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