[FRESH PR] add: visitor-counter-api

[mondalsurojit]

🎯 Title and Issue Number

[New API] : Visitor Counter API #301

Closes #301

🗒️ Checklist:

• [X] I have mentioned the issue number in my Pull Request.
• [X] I have gone through rules of when PR will get merged.
• [X] I have commented my code, particularly in hard-to-understand areas
• [X] I have created a helpful and easy to understand README.md
• [X] I have followed proper file structure.

• [X] I have gone through CONTRIBUTING GUIDELINES.md.

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[dishamodi0910]

Hey @mondalsurojit, Thank you for creating PR! We will review it super soon. 😇❣️ As we continue to evolve and innovate, we encourage you to share your ideas, feedback, and code to help us push the boundaries of what's possible in the world of APIs🚀. We hope you have followed CONTRIBUTING GUIDELINES. Thank you for being an essential part of our community. Together, we'll keep building amazing things! Don’t forget to ⭐ our repository! Happy Coding!✨ Will See you soon❣️