Added env.example File for Environment Variable Configuration

[vamshi726]

Summary of Changes:

Added a .env.example file to provide a template for environment variables used in the project.
Included placeholders for Cloudinary credentials, Google OAuth credentials, JWT secret, email settings, MongoDB connection string, React app base URL, and Unsplash API key.

Fixes #474

Type of change

Please mark with an X the type that applies:

• Documentation update

Motivation and Context

Adding a .env.example file helps new contributors understand the required environment variables and how to configure them for local development. This improves the onboarding process and ensures consistency in environment setups.

How Has This Been Tested?

This change doesn’t require specific tests since it involves adding a sample configuration file.

Test A: Verified that the .env.example file includes all necessary environment variables and provides clear instructions.

Test B: Confirmed that the file format is correct and that placeholders are accurately described.

Screenshots and Videos

No screenshots or videos are applicable for this change.

Checklist

Please mark with an X the items that apply:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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