readme: add readme

Author: Firestar99

README.md

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+# rust-gpu templates
+
+Examples on how to setup rust-gpu with various APIs, use-cases and integration paths.
+
+## Generating a project
+
+Install cargo-generate
+
+```sh
+cargo install cargo-generate
+```
+
+or if you have [no time, use cargo-binstall](https://github.com/cargo-bins/cargo-binstall):
+
+```sh
+cargo binstall cargo-generate
+```
+
+Then generate this template and answer the questions to configure it: (more details below)
+
+```sh
+cargo generate --git https://github.com/Rust-GPU/rust-gpu-template
+```
+
+If you don't want to install `cargo generate`, you can also go to the
+[
+`generated/` folder](https://github.com/Rust-GPU/rust-gpu-template/tree/main/generated/) and navigate its subfolders, each level corresponding to the questions below.
+
+## Questions
+
+1. **Which sub-template should be expanded?**
+
+We currently only have a "graphics" template, showcasing how to use rust-gpu for vertex and fragment shaders. More templates to come!
+
+2. **What API?**
+
+You can choose between the high-level [wgpu](https://github.com/gfx-rs/wgpu) API with browser support and [ash](https://github.com/ash-rs/ash), a lightweight wrapper around the low level Vulkan API. If you're new to graphics, we recommend you start at [learn wgpu](https://sotrh.github.io/learn-wgpu/), and once you have a basic triangle or compute shader working, return here.
+
+3. **How to integrate rust-gpu?**
+
+[cargo-gpu](https://github.com/Rust-GPU/cargo-gpu) is a rust-gpu installation manager, which isolates the specific nightly toolchain that rust-gpu requires, thus allowing the rest of your project to remain on a stable toolchain (or any other toolchain). In addition, it is also a command line tool you can use. Whereas the "raw" [spirv-builder](https://github.com/Rust-GPU/rust-gpu/tree/main/crates/spirv-builder) setup requires your entire project to be compiled using the specific nightly rust-gpu toolchain. Note that cargo-gpu merely wraps spirv-builder, making it easy to switch and keep most of your configuration between both platforms.