docs: Add README with examples for CocoIndex projects

examples/README.md

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+# Examples
+
+This folder contains example CocoIndex projects, designed to help you learn CocoIndex features and inspire you to build powerful indexing solutions.
+
+Check out our [examples documentation](https://cocoindex.io/docs/examples) for more details.
+
+## Vector Search & Embedding
+
+- 📄 [**text_embedding**](./text_embedding) - Build text embedding index from local markdown files and perform semantic search
+- 📄 [**text_embedding_lancedb**](./text_embedding_lancedb) - Build text embedding index with LanceDB as vector database
+- 📄 [**text_embedding_qdrant**](./text_embedding_qdrant) - Build text embedding index with Qdrant as vector database
+- 📄 [**pdf_embedding**](./pdf_embedding) - Build embedding index from PDF files and query with natural language
+- 🖼️ [**image_search**](./image_search) - Build live image search using multimodal embedding models
+- 🖼️ [**pdf_elements_embedding**](./pdf_elements_embedding) - Extract text and images from PDFs and build multimodal search
+- 🖼️ [**multi_format_indexing**](./multi_format_indexing) - Build visual document index from PDFs and images with ColPali
+- 👤 [**face_recognition**](./face_recognition) - Recognize faces in images and build embedding index
+
+## Cloud Storage Sources
+
+- ☁️ [**amazon_s3_embedding**](./amazon_s3_embedding) - Build embedding index from Amazon S3 bucket with continuous sync
+- ☁️ [**azure_blob_embedding**](./azure_blob_embedding) - Build embedding index from Azure Blob Storage with continuous sync
+- ☁️ [**gdrive_text_embedding**](./gdrive_text_embedding) - Build embedding index from Google Drive files with real-time sync
+
+## Code & Documentation
+
+- 💻 [**code_embedding**](./code_embedding) - Build real-time index for codebase using Tree-sitter for syntax-aware chunking
+- 📚 [**docs_to_knowledge_graph**](./docs_to_knowledge_graph) - Build real-time knowledge graph from documents using LLM to extract relationships
+
+## Structured Data Extraction
+
+- 🏥 [**patient_intake_extraction**](./patient_intake_extraction) - Extract structured data from patient intake forms (PDF, Docx) using LLM
+- 🏥 [**patient_intake_extraction_baml**](./patient_intake_extraction_baml) - Extract structured data from patient intake PDFs using BAML
+- 📖 [**manuals_llm_extraction**](./manuals_llm_extraction) - Extract structured information from PDF manuals using Ollama
+- 📄 [**paper_metadata**](./paper_metadata) - Extract metadata (title, authors, abstract) from research papers in PDF
+
+## Custom Sources & Targets
+
+- 🌐 [**custom_source_hn**](./custom_source_hn) - Custom source example: index HackerNews content via API
+- 🌐 [**hn_trending_topics**](./hn_trending_topics) - Extract trending topics from HackerNews using LLM
+- 📝 [**custom_output_files**](./custom_output_files) - Export markdown files to local HTML with custom targets
+
+## Database Integration
+
+- 🗄️ [**postgres_source**](./postgres_source) - Use Postgres tables as source for CocoIndex flows
+
+## Production & Deployment
+
+- 🐳 [**fastapi_server_docker**](./fastapi_server_docker) - Run docker container with FastAPI query endpoint
+- 🔄 [**live_updates**](./live_updates) - Demonstrates live update feature to keep index synchronized with local directory
+
+## Recommendation Systems
+
+- 🛍️ [**product_recommendation**](./product_recommendation) - Build real-time recommendation engine with LLM and graph database
+
+---
+
+> **Note**: New to CocoIndex? Check out the [Getting Started](https://cocoindex.io/docs/getting_started) guide first!
+> 
+> **Contribute**: We welcome contributions! Submit a [pull request](https://github.com/cocoindex-io/cocoindex/pulls) to add more examples.