📝 Add LICENSE and README.md

Signed-off-by: Julius Koskela <julius.koskela@unikie.com>

LICENSE

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+MIT License
+
+Copyright (c) 2023 Julius Koskela
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Rust wGPU Matrix Multiplication Shader Test
+
+## Overview
+
+This project demonstrates a matrix multiplication operation using compute shaders in Rust with the wGPU library. The primary goal is to showcase how to perform a simple matrix multiplication on the GPU, leveraging the power of parallel computation provided by shaders.
+
+## Features
+
+- Matrix multiplication using a compute shader.
+- Implementation using Rust and the wGPU library.
+- Efficient GPU-based computation for matrix operations.
+
+## Prerequisites
+
+- Rust programming language.
+- wGPU library for Rust.
+- GPU that supports WebGPU.
+
+## Getting Started
+
+### Installation
+
+1. Clone the repository:
+
+   ```bash
+   git clone https://github.com/your-repository/rust-wgpu-matrix-multiplication.git
+   cd rust-wgpu-matrix-multiplication
+   ```
+
+2. Ensure you have the latest version of Rust installed:
+
+   ```bash
+   rustup update
+   ```
+
+### Build and Run
+
+1. Build the project using Cargo, Rust's package manager and build system:
+
+   ```bash
+   cargo build --release
+   ```
+
+2. Run the compiled binary:
+
+   ```bash
+   cargo run --release
+   ```
+
+## Project Structure
+
+- `src/main.rs`: The main entry point for the application.
+- `src/ppu.rs`: Contains the `PPU` struct for handling GPU tasks.
+- `shaders/`: Folder containing WGSL shader files.
+
+## Shader
+
+The matrix multiplication logic is implemented in a WGSL shader. The shader takes two input matrices (`matrixA` and `matrixB`) and outputs the product (`matrixC`).
+
+## How It Works
+
+- The compute shader (`main`) is dispatched with a workgroup size of 4x4.
+- Each work item calculates one element of the product matrix.
+- The result is written back to a buffer that is read by the Rust application.
+
+## Contributing
+
+Contributions to this project are welcome. Please open an issue or pull request on the GitHub repository.
+
+## License
+
+This project is open-source and available under the [MIT License](LICENSE).