[Docs] Added known issues subsection to build documentation.

Also added construction icon to Vulkan support in Android since it's not working at the moment.

README.md

@@ -37,7 +37,7 @@ with Introduction, Hello Triangle Tutorial, and Extensibility Example with [GLFW
 | <img src="docu/Icons/linux.svg" height="20" /> GNU/Linux | [![GNU/Linux CI](https://github.com/LukasBanana/LLGL/actions/workflows/ci_linux.yml/badge.svg)](https://github.com/LukasBanana/LLGL/actions/workflows/ci_linux.yml) | N/A | N/A | :heavy_check_mark: | :heavy_check_mark: | N/A |
 | <img src="docu/Icons/macos.svg" height="20" /> macOS | [![macOS CI](https://github.com/LukasBanana/LLGL/actions/workflows/ci_macos.yml/badge.svg)](https://github.com/LukasBanana/LLGL/actions/workflows/ci_macos.yml) | N/A | N/A | N/A | :heavy_check_mark: | :heavy_check_mark: |
 | <img src="docu/Icons/ios.svg" height="20" /> iOS | [![iOS CI](https://github.com/LukasBanana/LLGL/actions/workflows/ci_ios.yml/badge.svg)](https://github.com/LukasBanana/LLGL/actions/workflows/ci_ios.yml) | N/A | N/A | N/A | :heavy_check_mark: | :heavy_check_mark: |
-| <img src="docu/Icons/android.svg" height="20" /> Android | [![Android CI](https://github.com/LukasBanana/LLGL/actions/workflows/ci_android.yml/badge.svg)](https://github.com/LukasBanana/LLGL/actions/workflows/ci_android.yml) | N/A | N/A | :heavy_check_mark: | :heavy_check_mark: | N/A |
+| <img src="docu/Icons/android.svg" height="20" /> Android | [![Android CI](https://github.com/LukasBanana/LLGL/actions/workflows/ci_android.yml/badge.svg)](https://github.com/LukasBanana/LLGL/actions/workflows/ci_android.yml) | N/A | N/A | :construction: | :heavy_check_mark: | N/A |
 | <img src="docu/Icons/wasm.svg" height="20" /> Wasm | [![WebAssembly CI](https://github.com/LukasBanana/LLGL/actions/workflows/ci_wasm.yml/badge.svg)](https://github.com/LukasBanana/LLGL/actions/workflows/ci_wasm.yml) | N/A | N/A | N/A | :heavy_check_mark: | N/A |
 
 

docu/README.md

@@ -42,6 +42,10 @@ On Windows, MSYS2 can be used to run *BuildAndroid.sh*.
     <img src="Showcase/Showcase_Build_AndroidStudio.png" alt="Screenshot missing: AndroidStudio Build Showcase" style="max-width:600px;width:70%;height:auto;">
 </p>
 
+##### Known issues
+
+Currently only the GLES backend is supported for Android. Vulkan backend compiles but is not stable and untested at the moment.
+
 
 ## GNU/Linux
 
@@ -84,3 +88,9 @@ Then launch your web browser of choice and open the URL http://localhost:8000/.
     <img src="Showcase/Showcase_Build_Wasm.png" alt="Screenshot missing: HTML5 Example Showcase" style="max-width:600px;width:70%;height:auto;">
 </p>
 
+##### Known issues
+
+The **WebGL backend does not work correctly on Safari**. There is a workaround which detects Safari browsers to disable anti-aliasing which mitigates the issue on Intel based Macs.
+On all ARM based Macs and iOS devices, Safari shows synchronization issues that mostly affect buffer updates via `glBufferSubData` making it look as if staging buffers
+are not synchronized between CPU and GPU, even though WebGL does not have a concept of staging buffers like Vulkan or D3D.
+