EDIT: Docs and minor bug fixed

docs/TROUBLESHOOTING.md

@@ -0,0 +1,26 @@
+**Troubleshooting**
+
+- Shader compiler not found
+  - Ensure `glslangValidator` (and/or `glslc` on Windows) is on `PATH`.
+  - Re‑open your terminal after installing the Vulkan SDK.
+
+- Windows SDK version mismatch
+  - `CMakeLists.txt` references `C:/VulkanSDK/1.3.296.0` by default.
+  - Update the path or set `VULKAN_SDK` to your installed version.
+
+- Validation errors on startup
+  - Update GPU drivers and Vulkan SDK.
+  - Try running a Release build to confirm if the issue is validation‑only.
+
+- Black screen or out‑of‑date swapchain
+  - Resize the window once to force a swapchain rebuild.
+  - Check the ImGui “Targets” window for swapchain/draw formats and extent.
+
+- No models rendering
+  - Verify `assets/police_office.glb` exists (see `docs/ASSETS.md`).
+  - Open the “Scene” window to confirm draw counts > 0.
+
+- Shader changes not visible
+  - Confirm the `.spv` file changed (timestamp) and click “Reload Changed” in the Pipelines window.
+  - Ensure you are editing the correct files referenced by `shaderPath()`.
+