[DOCS]: Building & Using

Docs/BUILDING.md

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+## 🛠️ Building IACore
+
+IACore uses **CMake Presets** to manage toolchains and cross-compilation. This ensures that the correct compilers (Clang) and flags (AVX2/SIMD) are used automatically.
+
+### Prerequisites
+* CMake 3.28+
+* Ninja Build System
+* Vcpkg (Environment variable `VCPKG_ROOT` must be set)
+* Clang / Clang-CL
+
+### Build Instructions
+
+**1. Configure**
+Select the preset for your target platform.
+```bash
+# List available presets
+cmake --list-presets
+
+# Configure for your platform (e.g., windows-x64, linux-arm64, wasm)
+cmake --preset windows-x64
+```
+
+**2. Build**
+
+```bash
+cmake --build --preset windows-x64
+```
+
+**3. Test (Optional)**
+
+```bash
+ctest --preset windows-x64
+```
+
+### Presets
+
+|Preset       |Description                   |Toolchain                           |
+|-------------|------------------------------|------------------------------------|
+|windows-x64  |Windows (Clang-CL)            |CMake/Toolchains/windows-x64.cmake  |
+|linux-x64    |Linux (Clang)                 |CMake/Toolchains/linux-x64.cmake    |
+|wasm         |WebAssembly (Emscripten)      |CMake/Toolchains/wasm.cmake         |
+|windows-arm64|Windows on ARM (Cross-compile)|CMake/Toolchains/windows-arm64.cmake|
+|linux-arm64  |Linux on ARM (Cross-compile)  |CMake/Toolchains/linux-arm64.cmake  |

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)
+
+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)
+```