adding a quick README

README.md

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+# Twig Extensions Plugin for Pattern Lab
+
+The Twig Extensions Plugin adds support for the [Twig Extensions Library](http://twig.sensiolabs.org/doc/extensions/index.html#extensions-install) to the [Twig PatternEngine for Pattern Lab](https://github.com/pattern-lab/patternengine-php-twig).
+
+## Installation
+
+Pattern Lab PHP uses [Composer](https://getcomposer.org/) to manage project dependencies with Pattern Lab Editions. To add the Twig Extensions Plugin to the dependencies list for your Edition you can type the following in the command line at the base of your project:
+
+    composer require pattern-lab/plugin-twig-extensions
+
+See Packagist for [information on the latest release](https://packagist.org/packages/pattern-lab/plugin-twig-extensions).