feat: add setup scripts and improve dependency installation

- Add setup.sh for macOS/Linux with dependency installation
- Add setup.bat for Windows with dependency installation
- Update README with clearer setup instructions in Quickstart
- Add troubleshooting for "ModuleNotFoundError: No module named 'mcp'"
- Provide manual installation steps as fallback

This helps users avoid the common "ModuleNotFoundError" by ensuring
dependencies are properly installed before first use.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

setup.bat

@@ -0,0 +1,66 @@
+@echo off
+REM Gemini MCP Server Setup Script for Windows
+REM This script helps users set up the virtual environment and install dependencies
+
+echo Gemini MCP Server Setup
+echo =======================
+
+REM Get the directory where this script is located
+set SCRIPT_DIR=%~dp0
+cd /d "%SCRIPT_DIR%"
+
+REM Check if Python is installed
+python --version >nul 2>&1
+if errorlevel 1 (
+    echo Error: Python is not installed or not in PATH.
+    echo Please install Python 3.10 or higher from https://python.org
+    echo Make sure to check "Add Python to PATH" during installation.
+    exit /b 1
+)
+
+REM Display Python version
+echo Found Python:
+python --version
+
+REM Check if venv exists
+if exist "venv\" (
+    echo Virtual environment already exists
+) else (
+    echo Creating virtual environment...
+    python -m venv venv
+    if errorlevel 1 (
+        echo Error: Failed to create virtual environment
+        exit /b 1
+    )
+    echo Virtual environment created
+)
+
+REM Activate virtual environment
+echo Activating virtual environment...
+call venv\Scripts\activate.bat
+
+REM Upgrade pip
+echo Upgrading pip...
+python -m pip install --upgrade pip
+
+REM Install requirements
+echo Installing dependencies...
+pip install -r requirements.txt
+
+if errorlevel 1 (
+    echo.
+    echo Error: Failed to install dependencies
+    echo Please check the error messages above and try again.
+    exit /b 1
+) else (
+    echo.
+    echo Setup completed successfully!
+    echo.
+    echo Next steps:
+    echo 1. Get your Gemini API key from: https://makersuite.google.com/app/apikey
+    echo 2. Configure Claude Desktop with your API key (see README.md)
+    echo 3. Restart Claude Desktop
+    echo.
+    echo Note: The virtual environment has been activated for this session.
+    echo The run_gemini.bat script will automatically activate it when needed.
+)