Added Catalan Number Calculator

[Will2Jacks]

Fixes Issue🛠️

Closes #1271

Description👨‍💻

Added the Catalan Calculator.

Type of Change📄

• [x] New feature (non-breaking change which adds functionality)

Checklist✅

• [x] I am an Open Source contributor
• [x] I have performed a self-review of my code
• [x] My code follows the style guidelines of this project

Screenshots/GIF📷

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[Nihal4777]

@Will2Jacks You should add calculator in main index.html file.

[Will2Jacks]

@Nihal4777
I have made the required changes in the main index.html file of my branch(Task)

[Rakesh9100]

Pls attach the screenshots of your work @Will2Jacks

[Will2Jacks]

@Rakesh9100 Added screenshot

[github-actions[bot]]

Congrats, Your pull request has been successfully merged 🥳🎉 Thank you for your contribution to my project 🚀 Keep Contributing!! ✨ @Will2Jacks