[JS] Add spinning loader

[DhanushNehru]

Title and Issue number

Title : Spinning Loader

Issue No. :https://github.com/sadanandpai/frontend-mini-challenges/issues/300

Code Stack : html, css

Close #

Checklist:

• [x] I have mentioned the issue number in my Pull Request.
• [x] I have commented my code, particularly in hard-to-understand areas
• [] I have created a helpful and easy to understand README.md
• [x] I have updated the Index.html file for my contribution

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[DhanushNehru]

Done @arpansaha13