Add CMake workflow badge

README.md

@@ -25,6 +25,7 @@ Ready to learn? Jump to [code examples!](http://www.raylib.com/examples.html)
 [![macOS](https://github.com/raysan5/raylib/workflows/macOS/badge.svg)](https://github.com/raysan5/raylib/actions?query=workflow%3AmacOS)
 [![Android](https://github.com/raysan5/raylib/workflows/Android/badge.svg)](https://github.com/raysan5/raylib/actions?query=workflow%3AAndroid)
 [![WebAssembly](https://github.com/raysan5/raylib/workflows/WebAssembly/badge.svg)](https://github.com/raysan5/raylib/actions?query=workflow%3AWebAssembly)
+[![CMake-multi](https://github.com/raysan5/raylib/workflows/CMake/badge.svg)](https://github.com/raysan5/raylib/actions?query=workflow%3ACMake)
 
 features
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