docs: add detailed macOS setup instructions

- Create SETUP_MACOS.md with step-by-step guidance
- Include both automatic (setup.sh) and manual setup options
- Add troubleshooting for common issues
- Provide clear examples and Terminal tips
- Explain virtual environment usage for beginners

Helps macOS users properly set up the project environment.

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

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

SETUP_MACOS.md

@@ -0,0 +1,105 @@
+# macOS Setup Instructions for Gemini MCP Server
+
+## Quick Setup (Recommended)
+
+If you've already cloned the repository, simply run:
+
+```bash
+cd ~/gemini-mcp-server    # or wherever you cloned it
+./setup.sh
+```
+
+This will automatically create a virtual environment and install all dependencies.
+
+## Manual Setup Instructions
+
+### 1. Open Terminal and Navigate to Your Project
+
+First, open Terminal (press `⌘ + Space`, type "Terminal", press Enter).
+
+Navigate to where you cloned the gemini-mcp-server:
+
+```bash
+# If you cloned to your home directory:
+cd ~/gemini-mcp-server
+
+# If you cloned elsewhere, replace with your path:
+cd /path/to/gemini-mcp-server
+```
+
+**Tip:** You can drag the folder from Finder into Terminal to get the full path!
+
+### 2. Check Your Python Version
+
+Make sure you have Python 3.10 or newer:
+
+```bash
+python3 --version
+```
+
+If you see Python 3.9 or older, install a newer version:
+```bash
+# Using Homebrew (recommended):
+brew install python@3.10
+```
+
+### 3. Create the Virtual Environment
+
+Run this command in your project directory:
+
+```bash
+python3 -m venv venv
+```
+
+This creates a folder called `venv` in your project directory.
+
+### 4. Activate the Virtual Environment
+
+```bash
+source venv/bin/activate
+```
+
+You'll see `(venv)` appear at the beginning of your Terminal prompt.
+
+### 5. Install Dependencies
+
+With the virtual environment activated:
+
+```bash
+pip install -r requirements.txt
+```
+
+## Verifying Your Setup
+
+After setup, you should have:
+- A `venv` folder in your gemini-mcp-server directory
+- All dependencies installed (no "ModuleNotFoundError")
+- The ability to run the server
+
+## Daily Usage
+
+Each time you work with the project:
+
+1. Navigate to the project directory
+2. Activate the virtual environment: `source venv/bin/activate`
+3. When done, deactivate: `deactivate`
+
+## Troubleshooting
+
+**"python3: command not found"**
+- Install Python: `brew install python@3.10`
+
+**"Permission denied" errors**
+- Make sure you're in the right directory
+- Try: `chmod +x setup.sh` then `./setup.sh`
+
+**Still seeing "ModuleNotFoundError: No module named 'mcp'"**
+- Make sure the virtual environment is activated (you should see `(venv)`)
+- Re-run: `pip install -r requirements.txt`
+
+## Need Help?
+
+If you're stuck, please share:
+1. Your Python version: `python3 --version`
+2. Your current directory: `pwd`
+3. The exact error message you're seeing