chore: import upstream snapshot with attribution

examples/speech_graph/README.md

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+# Speech Graph Example
+
+This example demonstrates how to use Scrapegraph-ai for speech processing and analysis.
+
+## Features
+
+- Speech-to-text conversion
+- Audio processing
+- Text analysis
+- Sentiment analysis
+
+## Setup
+
+1. Install required dependencies
+2. Copy `.env.example` to `.env`
+3. Configure your API keys in the `.env` file
+
+## Usage
+
+```python
+from scrapegraphai.graphs import SpeechGraph
+
+graph = SpeechGraph()
+text = graph.process("audio_file.mp3")
+```
+
+## Environment Variables
+
+Required environment variables:
+- `OPENAI_API_KEY`: Your OpenAI API key
+- `WHISPER_API_KEY`: Your Whisper API key (optional)