Update README with features from releases v10.0 to v15.5.0

[Copilot]

README was missing features documented in release notes from v10.0 onwards.

Changes

Key capabilities section — Added 12 features from recent releases:

• Optional included folders for selective scanning
• Thumbnail caching
• Quick image actions (delete, share, download)
• Swipe to refresh
• Auto Light/Dark Theme
• Per-image re-OCR
• Image rotation
• In-app updates & OCR model download
• Enhanced gestures and zoom controls
• OCR for cloud images
• Details panel with quick Telegram actions

What's New section — Updated to reflect v15.5.0:

• Enhanced image viewer with redesigned experience
• Improved gesture controls and zoom functionality
• Smart rotation algorithm
• OCR capability for cloud-uploaded images
• Extensive stability improvements

Feature sources by release

• v10.7.0: Thumbnail caching, quick actions, OCR, details panel, swipe refresh
• v12.8.0: Auto theme, parallel OCR, included folders, rotation
• v13.1.0: In-app updates, OCR model download
• v15.5.0: Enhanced viewer, gestures, cloud OCR

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.