Add an initial rhi implementation that mimics the opengl implementation

common/rhi/shaders/README.md

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+# YACReader Flow RHI Shaders
+
+This directory contains the GLSL 4.50 shaders for the QRhiWidget-based flow implementation.
+
+## Files
+
+- `flow.vert` - Vertex shader (GLSL 450)
+- `flow.frag` - Fragment shader (GLSL 450)
+- `flow.vert.qsb` - Compiled vertex shader (multi-platform)
+- `flow.frag.qsb` - Compiled fragment shader (multi-platform)
+- `compile_shaders.bat` - Windows compilation script
+- `compile_shaders.sh` - Unix/macOS compilation script
+- `shaders.qrc` - Qt resource file
+
+## Compiling Shaders
+
+The shaders must be compiled to `.qsb` format using Qt's `qsb` tool before building YACReader.
+
+### Prerequisites
+
+Ensure `qsb` is in your PATH. It's typically located in:
+- Windows: `C:\Qt\6.x.x\msvc2019_64\bin\qsb.exe`
+- macOS: `/opt/Qt/6.x.x/macos/bin/qsb`
+- Linux: `/opt/Qt/6.x.x/gcc_64/bin/qsb`
+
+### Compilation
+
+**Windows:**
+```cmd
+cd common/rhi/shaders
+compile_shaders.bat
+```
+
+**Unix/macOS:**
+```bash
+cd common/rhi/shaders
+chmod +x compile_shaders.sh
+./compile_shaders.sh
+```
+
+The compiled `.qsb` files contain shader variants for:
+- OpenGL ES 2.0, 3.0
+- OpenGL 2.1, 3.0+
+- HLSL (Direct3D 11/12)
+- Metal Shading Language (macOS/iOS)
+
+## Note
+
+The `.qsb` files are included in the repository for convenience. Recompile only if you modify the shader source.