feat: add QUICK_START.md for concise documentation

[farazmirzax]

Pull Request Title

feat: add QUICK_START.md for concise documentation

Description

This PR addresses issue #22 by creating a concise QUICK_START.md file that provides developers with a quick reference guide to get started with the MERN Project CLI in under 2 minutes. The new file complements the existing comprehensive README.md by offering an essential commands overview without overwhelming new users.

Related Issue(s)

Resolves #22

Changes Made

If yes, do [x].

• Added a new feature
• Fixed a bug
• Refactored existing code
• Updated documentation
• Other (explain):

List and describe the main changes here:

1. Created QUICK_START.md - A concise ~90-line guide covering essential CLI commands and workflows
2. Added cross-reference link - Updated main README.md to prominently link to the Quick Start Guide
3. Organized content structure - Structured the quick start with logical sections: installation, essential commands, complete example, environment setup, and troubleshooting

Checklist

Please ensure the following have been completed:
If yes, do [x].

• Code compiles without errors
• Tests are written and passing (if applicable)
• Documentation is updated (in code or README as needed)
• Code adheres to style guidelines (Prettier, ESLint)

Dependencies

No new dependencies introduced.

Additional Notes

• Design Decision: Instead of replacing the comprehensive README, I created a separate file to give users both options (quick reference vs. detailed documentation)
• Content Coverage: The QUICK_START.md covers all 9 main CLI commands with practical examples
• User Experience: Includes a complete workflow example (building a blog app) to demonstrate real-world usage
• Accessibility: Added troubleshooting section for common issues new users might encounter
• Future-proof: The structure allows for easy updates as new CLI features are added

The QUICK_START.md maintains the same high-quality documentation standards as the main README while focusing on essential information for rapid onboarding.

Thank you for contributing to mern-project-cli!

[farazmirzax]

@manishraj27 Please have a look at this