Improve README

[adrianmcli]

See here for an example of a good, comprehensive, and well-designed README: https://github.com/clauderic/react-infinite-calendar

GitHub Short Description

• [x] A short informative sentence for link previews
• [x] Use an emoji in the description to get people's attention
• [x] Add a link to a demo page

README.md

• [ ] Have a nice logo
• [x] Have an awesome image/animated gif
• [x] Title of your project in plain Capitalized English
• [x] Short description and link to demo page

Badges from Shields.io

• [x] NPM version
• [x] Build status (Travis/Circle CI)
• [x] Dependencies
• [x] Code quality (Bithound or similar)
• [ ] Code coverage
• [x] License

Features

• [x] Use an emoji
• [x] Have at least 4 or 5 features
• [x] Keep the focus on simplicity, lightness (e.g. zero-dependency), and ease-of-use

Other Sections

• [x] Getting Started or Installation + Usage
• [x] API
• [x] Contributing guidelines

[adrianmcli]

Image should be replaced with a smaller file:

EDIT: done.