Adds intro documentation

README.md

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+# clipboard.js
+
+> A modern approach to copy & cut to the clipboard. No Flash. No dependencies. Just 1kb.
+
+## Install
+
+You can get it using bower:
+
+```
+bower install clipboard --save
+```
+
+Or [download as ZIP](https://github.com/zenorocha/clipboard.js/archive/master.zip).
+
+## Usage
+
+First, you need to instantiate it using a selector. This selector corresponds to the trigger element (usually a `<button>`).
+
+```js
+new Clipboard('.btn');
+```
+
+The easiest way to copy some content to the clipboard, is to include a `value` attribute in your trigger element.
+
+```html
+<button class="btn" value="lorem ipsum">Copy</button>
+```
+
+Another way of doing it is to copy the content from an `<input>` or `<textarea`>. You can do that by adding a `for` attribute in your trigger element. The value you include in this `for` attribute needs to match another's element `id` attribute.
+
+```html
+<input id="target" value="Lorem ipsum">
+<button class="btn" for="target">Copy</button>
+```
+
+## Browser Support
+
+| <img src="https://raw.githubusercontent.com/alrra/browser-logos/master/chrome/chrome_64x64.png" width="48px" height="48px" alt="Chrome logo"> | <img src="https://raw.githubusercontent.com/alrra/browser-logos/master/firefox/firefox_64x64.png" width="48px" height="48px" alt="Firefox logo"> | <img src="https://raw.githubusercontent.com/alrra/browser-logos/master/internet-explorer/internet-explorer_64x64.png" width="48px" height="48px" alt="Internet Explorer logo"> | <img src="https://raw.githubusercontent.com/alrra/browser-logos/master/opera/opera_64x64.png" width="48px" height="48px" alt="Opera logo"> | <img src="https://raw.githubusercontent.com/alrra/browser-logos/master/safari/safari_64x64.png" width="48px" height="48px" alt="Safari logo"> |
+|:---:|:---:|:---:|:---:|:---:|
+| 42+ ✔ | 41+ ✔ | 9+ ✔ | 29+ ✔ | ✘ |
+
+## License
+
+[MIT License](http://zenorocha.mit-license.org/) © Zeno Rocha