docs: ✏️ add README

.prettierrc.js

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+module.exports = {
+  proseWrap: "always"
+};

README.md

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+<div align="center">
+<h1>user-event</h1>
+
+<a href="https://www.emojione.com/emoji/1f415">
+<img height="80" width="80" alt="dog" src="https://raw.githubusercontent.com/gpx/user-event/master/other/dog.png" />
+</a>
+
+<p>Simulate user events for <a href="https://github.com/kentcdodds/react-testing-library">react-testing-library</a></p>
+</div>
+
+<hr />
+
+[![Build Status](https://travis-ci.org/Gpx/user-event.svg?branch=master)](https://travis-ci.org/Gpx/user-event)
+[![Maintainability](https://api.codeclimate.com/v1/badges/75f1ff4397e994c6004e/maintainability)](https://codeclimate.com/github/Gpx/user-event/maintainability)
+[![Test Coverage](https://api.codeclimate.com/v1/badges/75f1ff4397e994c6004e/test_coverage)](https://codeclimate.com/github/Gpx/user-event/test_coverage)
+
+## The problem
+
+From
+[kentcdodds/dom-testing-library#107](https://github.com/kentcdodds/dom-testing-library/issues/107):
+
+> [...] it is becoming apparent the need to express user actions on a web page
+> using a higher-level abstraction than `fireEvent`
+
+## The solution
+
+`user-event` tries to simulate the real events that would happen in the browser
+as the user interacts with it. For example `userEvent.click(checkbox)` would
+change the state of the checkbox.
+
+The library is still a work in progress and any help is appreciated.