[rs] Add readme and screenshots

.travis.yml

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+language: rust
+sudo: false
+os:
+  - linux
+  - osx
+  - windows
+
+branches:
+  except:
+  - staging.tmp

wgpu/README.md

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+## wgpu-rs
+[![Build Status](https://travis-ci.org/gfx-rs/wgpu-rs.svg)](https://travis-ci.org/gfx-rs/wgpu-rs)
+[![Crates.io](https://img.shields.io/crates/v/wgpu.svg)](https://crates.io/crates/wgpu)
+[![Gitter](https://badges.gitter.im/gfx-rs/webgpu.svg)](https://gitter.im/gfx-rs/webgpu)
+
+This is an idiomatic Rust wrapper over [wgpu-native](https://github.com/gfx-rs/wgpu). It's designed to be suitable for general purpose graphics and computation needs of Rust community. It currently only works for the native platform, in the future aims to support WASM/Emscripten platforms as well.
+
+## Gallery
+
+![Cube](etc/example-cube.png) ![Shadow](etc/example-shadow.png)
+![vange-rs](etc/vange-rs.png) ![Brawl](etc/brawl-attack.gif)
+
+## Usage
+
+The library requires one of the following features enabled in order to run any of the examples:
+  - "vulkan"
+  - "metal"
+  - "dx12"
+  - "dx11"
+
+These examples assume that necessary dependencies for the graphics backend are already installed. For more information about installation and usage, refer to the [Getting Started](https://github.com/gfx-rs/gfx/blob/master/info/getting_started.md) gfx-rs guide.