Add readme and license

README.md

@@ -0,0 +1,46 @@
+# Unity VFX Graph Gaussian Splatting Renderer
+
+A Unity implementation of Gaussian splatting using VFX Graph for real-time rendering. This project uses Unity's VFX Graph system as an alternative to the EWA algorithm to provide more flexibility in accessing the splat's data structures.
+
+## Installation
+
+Import this project into Unity or copy the `Assets/vfx-graph-gs/` folder to your project
+
+## Usage
+
+### Importing PLY Files
+
+1. Place your PLY file containing Gaussian splat data in your project
+2. The custom `SplatImporter` will automatically process the file
+3. A VFX prefab will be generated that you can drag on to a scene
+
+## File Structure
+
+```
+Assets/vfx-graph-gs/
+├── Scripts/                    # Core C# implementation
+│   ├── SplatData.cs           # Data container and GPU buffer management
+│   ├── SplatDataBinder.cs     # VFX Graph integration
+│   ├── SplatDataInspector.cs  # Custom inspector for SplatData
+│   └── SplatImporter.cs       # PLY file importer with burst compilation
+├── VFXGraphHLSL/              # GPU shader functions
+│   ├── CalculateAxes.hlsl     # Quaternion to matrix conversion
+│   ├── CalculateSH.hlsl       # Spherical harmonics calculations
+│   └── GetMajorAxes.hlsl      # Projection axis selection
+├── SplatVFX.vfx              # Main VFX Graph asset
+└── [PLY files]               # Gaussian splat data files
+```
+
+## License
+
+This project is licensed under the MIT License. See the LICENSE file for details.
+
+## References
+
+- [Original Gaussian Splatting Code](https://github.com/graphdeco-inria/gaussian-splatting)
+- [SplatVFX](https://github.com/keijiro/SplatVFX)
+
+
+> ## Additional Notes
+> - The importer processes files in 256MB chunks to handle large files
+> - Presently, the splat file *must* have all splat data present, including spherical harmonics. It currently only supports `float` type variables and binary-encoded files.