Add comprehensive installation guide for 50+ MCP environments

- Created detailed INSTALLATION.md with step-by-step instructions
- Added support for all major MCP-compatible platforms including:
  - Desktop AI: Claude Desktop, Claude Code CLI
  - Editors: Cursor, VS Code, Windsurf, Zed, IntelliJ IDEA, PyCharm, etc.
  - Extensions: Cline, Continue.dev, CodeGPT, GitHub Copilot
  - Cloud: AWS, Azure, GCP, Replit
  - Containers: Docker, Kubernetes
  - Mobile: iOS, Android
  - Enterprise: Slack, Teams, Discord
- Used Context7-style collapsible format with proper icons
- Added both remote and local server configuration options
- Included prerequisites, verification steps, and troubleshooting
- Updated README.md with prominent link to installation guide

Resolves #2176

Author: MAVRICK-1