IACore v1.2

Docs/USING.md

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+## 🚀 Using IACore in a New Project
+
+IACore provides a CMake macro `iacore_setup_project()`, which standardizes your build environment. This macro automatically:
+
+* Enforces C++20 standard.
+* Sets warning levels (-Wall -Wextra -Wpedantic for Clang/GCC, /W4 for MSVC/Clang-CL).
+* Detects the target architecture (x64, ARM64, WASM) and sets internal cache variables.
+* Suppresses C++98 compatibility warnings when using Clang on Windows.
+
+Example CMakeLists.txt
+```cmake
+cmake_minimum_required(VERSION 3.28)
+project(MyGame)
+
+# Or you can use FetchContent
+add_subdirectory(external/IACore)
+
+## Apply IACore's standard project configuration
+# This applies C++20 and strict warning flags globally to your targets.
+iacore_setup_project()
+
+# Define your target(s)
+add_executable(MyGame src/main.cpp)
+
+# Link IACore
+target_link_libraries(MyGame PRIVATE IACore)
+```