更新阅读器功能与示例

Sources/RDSpeechReaderView/README.md

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+# RDSpeechReaderView
+
+`RDSpeechReaderView` provides bounded, on-device text-to-speech playback for
+ReadViewSDK readers. It uses `AVSpeechSynthesizer` and does not upload book
+content or create exportable audio files.
+
+## Install
+
+```ruby
+pod 'RDSpeechReaderView'
+pod 'RDPDFReaderView/Speech'
+pod 'RDEpubReaderView/Speech'
+```
+
+The host app must enable the **Audio, AirPlay, and Picture in Picture**
+background mode to continue reading after it enters the background.
+
+## Use with PDF
+
+```swift
+let provider = reader.makeSpeechContentProvider()
+let speech = RDSpeechReaderController(contentProvider: provider)
+try await speech.start()
+```
+
+The PDF adapter reads `RDPDFReaderTextRun` values supplied by the host or by
+PDFKit. Image-only PDFs require an OCR-backed provider before they can speak.
+
+For automatic page navigation and temporary read-aloud highlighting, create a
+PDF session instead:
+
+```swift
+let session = reader.makeSpeechSession()
+try await session.start(from: 0)
+```
+
+## Use with EPUB
+
+```swift
+let provider = reader.makeSpeechContentProvider()
+let speech = RDSpeechReaderController(contentProvider: provider)
+try await speech.start(from: nil)
+```
+
+Speech locations use EPUB `href` plus a UTF-16 text offset. They remain stable
+when the user changes fonts or page size, unlike screen page numbers.