Add Tibetan Sorting HTML app with iframe support

[Copilot]

This PR adds a basic HTML page that provides a simple web interface for the Tibetan sorting functionality, making it easy to use and embed as an iframe.

Features

The new index.html file provides:

• Clean, responsive interface with the requested title "Tibetan Sorting app"
• Large text input area for entering Tibetan text or EWTS transliteration (one item per line)
• Two sorting buttons as requested:
  • "Sort" - sorts Unicode Tibetan text using the library's compare() function
  • "Sort Wylie" - sorts EWTS (Extended Wylie) transliteration using the compareEwts() function
• Iframe-friendly design - easily embeddable in other websites
• Error handling with user-friendly alerts for empty input
• Example text in placeholder to help users understand the input format
• Keyboard shortcuts (Ctrl+1 for Sort, Ctrl+2 for Sort Wylie)

Usage

Users can:

1. Enter Tibetan text or EWTS transliteration in the text area (one item per line)
2. Click either sorting button
3. See the sorted result replace the original content in the same text area

Example

Input:

ཤེས་རབ་
སྙིང་པོ་ 
ཐེག་པ་
ཆོས་ཀྱི་

After clicking "Sort":

ཆོས་ཀྱི་
སྙིང་པོ་
ཐེག་པ་
ཤེས་རབ་

The app correctly sorts according to traditional Tibetan alphabetical order using the repository's proven sorting algorithms.

Iframe Embedding

The page is designed to work seamlessly when embedded:

<iframe src="path/to/index.html" title="Tibetan Sorting App" width="800" height="600"></iframe>

Files Added

• index.html - The main sorting application
• HTML-APP-README.md - Documentation for the HTML app

The implementation is minimal and focused, adding only the essential functionality requested without modifying any existing library code.

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[eroux]

please make it so that it is automatically deployed on github pages at each push