docs: add security and code quality badges

- Add CodeQL workflow status badge
- Add SonarCloud security rating badge
- Add maintainability rating badge
- Add lines of code badge
- Add code coverage badge

README.md

@@ -4,6 +4,12 @@
 
 Transform GPU monitoring from complex metrics into intuitive visual patterns. Enterprise-grade NVIDIA GPU monitoring with real-time analytics, intelligent alerts, and historical analysis.
 
+[![CodeQL](https://github.com/jackccrawford/gpu-sentinel-pro/actions/workflows/codeql.yml/badge.svg)](https://github.com/jackccrawford/gpu-sentinel-pro/actions/workflows/codeql.yml)
+[![Security Rating](https://sonarcloud.io/api/project_badges/measure?project=jackccrawford_gpu-sentinel-pro&metric=security_rating)](https://sonarcloud.io/summary/new_code?id=jackccrawford_gpu-sentinel-pro)
+[![Maintainability Rating](https://sonarcloud.io/api/project_badges/measure?project=jackccrawford_gpu-sentinel-pro&metric=sqale_rating)](https://sonarcloud.io/summary/new_code?id=jackccrawford_gpu-sentinel-pro)
+[![Lines of Code](https://sonarcloud.io/api/project_badges/measure?project=jackccrawford_gpu-sentinel-pro&metric=ncloc)](https://sonarcloud.io/summary/new_code?id=jackccrawford_gpu-sentinel-pro)
+[![Coverage](https://sonarcloud.io/api/project_badges/measure?project=jackccrawford_gpu-sentinel-pro&metric=coverage)](https://sonarcloud.io/summary/new_code?id=jackccrawford_gpu-sentinel-pro)
+
 ![Dark Mode Dashboard](images/DarkMode-Stressed.png)
 *Real-time GPU metrics visualized for instant comprehension*