Merge pull request electron#213 from electron/contributing

Create a CONTRIBUTING.md

Author: Jessica Lord

CONTRIBUTING.md

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+# Contributing to Electron API Demos
+
+[![JavaScript Standard Style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat)](http://standardjs.com)
+
+:+1::tada: First off, thanks for taking the time to contribute! :tada::+1:
+
+This project adheres to the Contributor Covenant [code of conduct](CODE_OF_CONDUCT.md).
+By participating, you are expected to uphold this code. Please report unacceptable
+behavior to [[email protected]](mailto:[email protected]).
+
+**See the [documentation](docs.md) for information on how this project works.**
+
+## Code Style & ES6
+
+This project uses the [JavaScript Standard](http://standardjs.com) style and limited E6 syntax.
+
+Because this project is intended for beginners we stick to mostly vanilla JavaScript. One of the features we want illustrate about Electron, however, is that you can use most of ES6 out of the box. To that end, in this project we use these parts of ES6:
+
+- [`const`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const)
+- [`let`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let)
+- [string templates](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals)
+
+## Pull Requests and Issues
+
+Tips for making an easier-to-reivew contribution:
+
+- Please provide a description.
+- Include screenshots and animated GIFs whenever possible.
+- Use short, present tense commit messages.