added preloader for the website, using html, css and js file

[Dharmi-dev]

Pull Request Template

Title:

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Description:

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Related Issue:

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Changes Made:

• Change 1
• Change 2
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Checklist:

• [ ] My code follows the code style of this project
• [ ] I have performed a self-review of my code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes

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