chore(README): show how to use engine in a cmake project

README.md

@@ -11,4 +11,26 @@ info [on this stack overflow post](https://stackoverflow.com/questions/57300495/
 ## Building
 Find more info about building the project in the `docs/Building.md` file.
 
-(CMake >= 3.28)
+(CMake >= 3.28)
+
+# Using the engine as a library
+You're more than welcome to use this engine for your game. The recommended way to build the project is using CMake:
+
+### Fetch Content:
+```cmake
+# Enable FetchContent module
+include(FetchContent)
+
+# Fetch the external repository
+FetchContent_Declare(
+    ICEngine
+    GIT_REPOSITORY http://proudcricle:3001/illyum/ICEngine.git
+    GIT_TAG        main
+)
+
+# Then add your sources and executable
+add_executable(MyGame main.cpp)
+
+# Link the ICEngine library to your project
+target_link_libraries(MyGame PRIVATE ICEngine)
+```