docs: enhance documentation structure and add project roadmap

- Refactor index.md with improved navigation and comprehensive documentation sections
- Update README.md to streamline documentation navigation
- Create new roadmap.md with detailed project goals and vision
- Add testing.md with comprehensive testing guidelines and best practices
- Improve overall documentation clarity and user experience

docs/roadmap.md

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+# Roadmap for MCP Server
+
+The following roadmap outlines our planned enhancements and future directions for the Home Assistant MCP Server. This document is a living artifact and will be updated regularly as new features are planned and developed.
+
+## Near-Term Goals
+
+- **Advanced Automation Capabilities:**
+  - Integrate more sophisticated automation rules with conditional logic and multi-step execution.
+  - Introduce a visual automation builder to simplify rule creation.
+
+- **Enhanced Security Features:**
+  - Implement multi-factor authentication for critical actions.
+  - Strengthen encryption methods and data handling practices.
+  - Expand monitoring and alerting for potential security breaches.
+
+- **Performance Optimizations:**
+  - Refine the server's resource utilization to reduce latency.
+  - Optimize real-time data streaming via SSE for higher throughput.
+  - Introduce advanced caching mechanisms for frequently requested data.
+
+## Mid-Term Goals
+
+- **User Interface Improvements:**
+  - Develop an intuitive, web-based dashboard for easier device management and monitoring.
+  - Provide real-time analytics and performance metrics in the dashboard.
+
+- **Expanded Integrations:**
+  - Support a broader range of smart home devices and brands.
+  - Integrate with additional home automation platforms and third-party services.
+
+- **Developer Experience Enhancements:**
+  - Improve documentation and developer tooling.
+  - Streamline contribution guidelines and testing setups.
+
+## Long-Term Vision
+
+- **Ecosystem Expansion:**
+  - Build a modular plugin system that allows community-driven extensions and integrations.
+  - Enable seamless integration with future technologies in the smart home and AI domains.
+
+- **Scalability and Resilience:**
+  - Architect the system to support large-scale deployments across multiple instances.
+  - Incorporate advanced load balancing and failover mechanisms.
+
+## How to Follow the Roadmap
+
+- **Community Involvement:** We encourage community feedback and contributions to help refine and prioritize our roadmap.
+- **Regular Updates:** This document is regularly updated with new goals, milestones, and completed tasks.
+- **Transparency:** Check the project's GitHub repository and issues for ongoing discussions and updates related to roadmap items.
+
+*This roadmap is intended to serve as a guide and may evolve based on community needs, technological advancements, and strategic priorities.*