Add LICENSE, package.json, CHANGELOG, and enhance documentation

- Add MIT License
- Add package.json with OpenClaw skill metadata
  - Explicitly declares NO required environment variables (fully local)
  - Documents data storage path: ~/.openclaw/data/rag/
  - Includes installation steps and available scripts
- Add CHANGELOG.md with version history (v1.0.0)
- Update README.md to:
  - Clarify no API keys required (fully local system)
  - Add documentation files section
  - Reference CHANGELOG, LICENSE, package.json
- Addresses security scanner best practices for transparency

README.md

@@ -16,11 +16,18 @@ Full-featured Retrieval-Augmented Generation (RAG) system for OpenClaw - search
 ### Installation
 
 ```bash
-# No external dependencies - just Python 3
+# Install Python dependency
 cd ~/.openclaw/workspace/rag
 python3 -m pip install --user chromadb
 ```
 
+**No API keys required** - This system is fully local:
+- Embeddings: all-MiniLM-L6-v2 (downloaded once, 79MB)
+- Vector store: ChromaDB (persistent disk storage)
+- Data location: `~/.openclaw/data/rag/` (auto-created)
+
+All operations run offline with no external dependencies besides the initial ChromaDB download.
+
 ### Index Your Data
 
 ```bash
@@ -311,10 +318,17 @@ MIT License - Free to use and modify
 
 Contributions welcome! Areas for improvement:
 - API documentation indexing from external URLs
-- Automated re-indexing cron job
+- File system watch for automatic re-indexing
 - Better chunking strategies for long documents
 - Integration with external vector stores (Pinecone, Weaviate)
 
+## Documentation Files
+
+- **CHANGELOG.md** - Version history and changes
+- **SKILL.md** - OpenClaw skill integration guide
+- **package.json** - Skill metadata (no credentials required)
+- **LICENSE** - MIT License
+
 ## Author
 
 Nova AI Assistant for William Mantly (Theta42)