Spiff up repo meta

Author: linuswillner

.github/CONTRIBUTING.md

@@ -0,0 +1,29 @@
+### Thank you for displaying interest in contributing to react-console-emulator!
+
+## Repository structure
+
+- `demo`
+  - The demo site at [linuswillner.me/react-console-emulator](https://linuswillner.me/react-console-emulator). Can be previewed with `npm start` and built with `npm run build`.
+- `src`
+  - Library code. All components related to how the library functions are located here.
+- `test`
+  - Unit tests, powered by Jest and Puppeteer.
+
+## Contribution rules
+
+You're free to implement changes that you believe will benefit the project in any manner, be it documentation improvements, code changes or something else. However, please consider the following before submitting a PR:
+
+- Your code must...
+  - Work as you intend it to
+  - Pass style checks as outlined by ESLint (`npm run lint`)
+  - Pass the unit tests and have such written if necessary (See the `test` folder, more below)
+  - Be documented if relevant
+  - Have a demo terminal written, if new terminal features are introduced
+
+## Testing
+
+Make sure the development dependencies are installed (`npm i`). Then run `npm run test-coverage` (For coverage) or `npm run test-nocoverage` (Without coverage) before you submit your PR. All tests must pass for the PR to be considered valid.
+
+**Note:** It's not recommended to run `npm test` locally, as that step also includes Codecov report uploading, which will fail locally due to missing authentication information. If you want to accurately emulate CI test flow, use `npm run test-local` instead.
+
+**Note about Puppeteer testing:** The jest-puppeteer toolchain [does not currently support collecting code coverage in a non-trivial way](https://github.com/smooth-code/jest-puppeteer/issues/90), so it's fine to set `/* istanbul ignore next: Covered by interactivity tests */` for any code that is covered by tests performed by Puppeteer until this changes.

README.md

@@ -2,6 +2,8 @@
 
 # react-console-emulator
 
+![Version](https://img.shields.io/npm/v/react-console-emulator) ![License](https://img.shields.io/npm/l/react-console-emulator) ![NPM downloads](https://img.shields.io/npm/dw/react-console-emulator) ![NPM bundle size](https://img.shields.io/bundlephobia/min/react-console-emulator) ![CircleCI](https://img.shields.io/circleci/build/github/linuswillner/react-console-emulator/master) ![Codecov](https://img.shields.io/codecov/c/github/linuswillner/react-console-emulator) 
+
 A simple, powerful and highly customisable Unix terminal emulator for React.
 
 [Live demo](https://linuswillner.me/react-console-emulator/)  
@@ -19,6 +21,8 @@ A simple, powerful and highly customisable Unix terminal emulator for React.
 
 ## Usage
 
+> See more command examples in [demo/extra/config.js](demo/extra/config.js) and [demo/App.jsx](demo/App.jsx)
+
 ```jsx
 import React, { Component } from 'react'
 import Terminal from 'react-console-emulator'
@@ -27,9 +31,7 @@ const commands = {
   echo: {
     description: 'Echo a passed string.',
     usage: 'echo <string>',
-    fn: function () {
-      return `${Array.from(arguments).join(' ')}`
-    }
+    fn: (...args) => args.join(' ')
   }
 }
 
@@ -46,6 +48,10 @@ export default class MyTerminal extends Component {
 }
 ```
 
+## Contributing
+
+For information on contributing, see [.github/CONTRIBUTING.md](.github/CONTRIBUTING.md).
+
 ## License
 
 MIT © Linus Willner and Curtis Fowler.