EDIT: Docs and minor bug fixed

docs/BUILD.md

@@ -0,0 +1,38 @@
+**Build & Environment**
+
+- Prerequisites
+  - Vulkan SDK installed and `VULKAN_SDK` set.
+  - A C++20 compiler and CMake ≥ 3.8.
+  - GPU drivers with Vulkan 1.2+.
+
+- Configure
+  - `cmake -S . -B build -DCMAKE_BUILD_TYPE=Debug`
+  - Re-run configure after toolchain or dependency changes.
+
+- Build (single-config)
+  - `cmake --build build --target vulkan_engine`
+
+- Build (multi-config, e.g., MSVC)
+  - `cmake --build build --config Release`
+
+- Run
+  - `./bin/vulkan_engine` (Linux/macOS)
+  - `bin/vulkan_engine.exe` (Windows)
+
+- Shaders
+  - CMake compiles GLSL via `glslangValidator` to SPIR‑V targeting Vulkan 1.2:
+    - Files under `shaders/*.vert|*.frag|*.comp` are rebuilt on `cmake --build`.
+  - Windows helper: `./compile_shaders.ps1` uses `glslc` with `--target-env=vulkan1.3` and supports additional stages (mesh/task/ray tracing).
+  - Ensure `glslangValidator`/`glslc` is on `PATH`. See `docs/SHADERS.md`.
+
+- Windows SDK note
+  - `CMakeLists.txt` includes a default SDK path for Windows `1.3.296.0`:
+    - Update the path or set `VULKAN_SDK` accordingly if your version differs.
+
+- Third‑party deps
+  - Vendored under `third_party/` and brought in via CMake. Do not edit headers directly; update through targets.
+
+- Validation Layers
+  - Enabled in Debug (`kUseValidationLayers = true` in `src/core/config.h`).
+  - Disable by building Release or toggling the flag during local experimentation.
+