Document how to run example in readme

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Rukai 2019-05-11 14:01:14 +10:00
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## Usage
This repository contains C-language examples that link to the native library targets and perform basic rendering and computation. You can test them with `make`.
This repository contains C-language examples that link to the native library targets and perform basic rendering and computation.
To run the C triangle example, install a C compiler + glfw 3, then run these commands at the root of the repo:
```
rustup toolchain install nightly
cargo install cbindgen
make examples-native
cd examples/hello_triangle_c/build
./hello_triangle
```
The idiomatic Rust wrapper lives in https://github.com/gfx-rs/wgpu-rs and provides a number of more complex examples to get a feel of the API.