Add QUICKSTART.md for rapid onboarding

Co-authored-by: BlackDadd77 <179016248+BlackDadd77@users.noreply.github.com>

Author: Copilot

QUICKSTART.md

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+# MCP Python SDK - Quick Start
+
+**Status**: ✅ **READY FOR DEVELOPMENT**
+
+## Setup (2 minutes)
+
+```bash
+# 1. Install uv
+pip install uv
+
+# 2. Sync dependencies
+uv sync
+
+# 3. Verify setup
+uv run --frozen ruff check .
+PYTEST_DISABLE_PLUGIN_AUTOLOAD="" uv run --frozen pytest -x
+```
+
+## Daily Development
+
+```bash
+# Format code
+uv run --frozen ruff format .
+
+# Run tests
+PYTEST_DISABLE_PLUGIN_AUTOLOAD="" uv run --frozen pytest
+
+# Type check
+uv run --frozen pyright
+
+# Build
+uv build
+```
+
+## Project Resources
+
+- **📖 Full Setup Guide**: `SETUP.md`
+- **📊 Status Report**: `PROJECT_STATUS.md`
+- **👥 Contributing**: `CONTRIBUTING.md`
+- **💻 Development Rules**: `CLAUDE.md`
+- **📚 Main Docs**: `README.md`
+
+## Test Results
+
+✅ 678 tests passing
+✅ All linting checks pass
+✅ Type checking passes
+✅ Build successful
+
+## Ready to Go!
+
+The project is fully configured. See `SETUP.md` for detailed instructions.