Added Falling Object Calculator

[SuhainaFathimaM]

Fixes Issue🛠️

Closes #1844

Description👨‍💻

Added Falling object under gravity calculator

1. Created index.html
2. Created style.css
3. Created script.js
4. Added hovering effects
5. Added Stylish background and good text effects
6. Added the Calculator to the main web page
7. Added README documentation

Type of Change📄

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

Checklist✅

• I am an Open Source contributor
• I have performed a self-review of my code
• My code follows the style guidelines of this project
• I have commented on my code, particularly in hard-to-understand areas

Screenshots/GIF📷

@Rakesh9100 I am contributing under GSSoC

[github-actions]

Hey @SuhainaFathimaM, Welcome to the project CalcDiverse! 🎊
Thanks for your contribution! Your effort makes this project better. Keep it up! 🙌
Please wait for the PR to be reviewed. Happy Coding!! ✨

[netlify]

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[Nihal4777]

This PR is reviewed, looks good, and can be merged ✨!

[github-actions]

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