Added README file

README.md

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+# mPDF Library Package for Joomla! CMS
+
+## Requirements
+
+* Joomla! 3+.
+* mPDF requirements: [https://github.com/mpdf/mpdf](https://github.com/mpdf/mpdf).
+
+## Installation
+
+Download the package of the latest release on [https://github.com/cmextension/mpdf/releases](https://github.com/cmextension/mpdf/releases), install it with Joomla! Extension Manager just like any other Joomla! extensions.
+
+## Usage
+
+In your Joomla! extension's code:
+
+```
+jimport('mpdf.mpdf');
+
+$html = '<h1>Hello World!</h1>';
+
+$mpdf = new \Mpdf\Mpdf();
+$mpdf->WriteHTML($html);
+$mpdf->Output();
+```
+
+Online manual of mPDF is available at [https://mpdf.github.io/](https://mpdf.github.io/).
+
+## Development
+
+* Clone this repository.
+* Go to `mpdf` folder.
+* Run `composer install` to install mPDF.
+
+## License
+
+GNU General Public License Version 2.