Create index.html for this Repository

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# Create `index.html` for OS Repository with CSS and JavaScript

## Description
Develop an `index.html` page to showcase information about supported operating systems for LinuxDroid. The webpage should be styled using an external `style.css` file and include interactivity through a `linuxdroid.js` file. Ensure the page is visually appealing, easy to navigate, and responsive across devices.

## Tasks
- [ ] Create an `index.html` file with a clean and semantic structure.
- [ ] Style the webpage using an external `style.css` file.
- [ ] Add interactivity using the `linuxdroid.js` file (if necessary).
- [ ] Include a navigation bar for easy access to different sections of the OS list.
- [ ] Ensure responsiveness for various screen sizes (desktop, tablet, mobile).
- [ ] Test the page across different browsers to ensure compatibility.

## Notes
- The CSS file (`style.css`) should follow best practices for styling, including mobile-first design.
- JavaScript (`linuxdroid.js`) should be lightweight and optimized for performance.

Create index.html, style.css, and linuxdroid.js for the OS showcase described in the issue. Start by inspecting the repository structure and existing project content, then build the navigation and responsive page; done means the page is usable across desktop, tablet, and mobile browsers, with lightweight JavaScript where needed.

Written by the indexing model from the issue text.