Add AgentAudit security badge

Author: starbuck100

README.md

@@ -7,6 +7,9 @@ A Model Context Protocol (MCP) server and CLI that provides tools for agent use
 
 ## Installation
 
+[![AgentAudit Security](https://img.shields.io/badge/AgentAudit-Safe-brightgreen?logo=data:image/svg%2Bxml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNCAyNCI+PHBhdGggZmlsbD0id2hpdGUiIGQ9Ik0xMiAxTDMgNXY2YzAgNS41NSAzLjg0IDEwLjc0IDkgMTIgNS4xNi0xLjI2IDktNi40NSA5LTEyVjVsLTktNHoiLz48L3N2Zz4=)](https://www.agentaudit.dev/skills/xcodebuildmcp)
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 XcodeBuildMCP ships as a single package with two modes: a **CLI** for direct terminal use and an **MCP server** for AI coding agents. Both installation methods give you both modes.
 
 ### Option A — Homebrew