Feature/authenticator

[aman-g202]

CHANGES:

• Improved authentication flow by using single application level middleware instead of checking on each route which is not good in terms of readability and maintainability of project.
• Removed .env from the repo by adding in .gitignore as it contains the critical keys, which is dangerous to expose to the public repo (Never do this).
• Added .env.sample for users to use this repo as an open-source project for their respective purposes.

If everything seems good to you please accept this PR by adding the label as "hacktoberfest-accepted"

Thank you!