Add readme.

README.md

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+Leaflet integration into Contao CMS
+===================================
+
+[![Build Status](http://img.shields.io/travis/netzmacht/contao-leaflet-maps/master.svg?style=flat-square)](https://travis-ci.org/netzmacht/contao-leaflet-maps)
+[![Version](http://img.shields.io/packagist/v/netzmacht/contao-leaflet-maps.svg?style=flat-square)](http://packagist.com/packages/netzmacht/contao-leaflet-maps)
+[![License](http://img.shields.io/packagist/l/netzmacht/contao-leaflet-maps.svg?style=flat-square)](http://packagist.com/packages/netzmacht/contao-leaflet-maps)
+[![Downloads](http://img.shields.io/packagist/dt/netzmacht/contao-leaflet-maps.svg?style=flat-square)](http://packagist.com/packages/netzmacht/contao-leaflet-maps)
+[![Contao Community Alliance coding standard](http://img.shields.io/badge/cca-coding_standard-red.svg?style=flat-square)](https://github.com/contao-community-alliance/coding-standard)
+
+This extension provides a backend gui for integrating [Leaflet](http://leafletjs.com/) into the Contao CMS.
+
+It has a highly flexible and customizable design so that 3rd party extensions and custom development is really easy. 
+Developing map applications in Contao with the modern Open Source Map library Leaflet made easy!
+  
+Features
+--------
+
+ - Define Leaflet maps with multiple layers.
+ - Manage map controls
+    - [Layers control](http://leafletjs.com/reference.html#control-layers)
+    - [Zoom control](http://leafletjs.com/reference.html#control-zoom)
+    - [Scale control]((http://leafletjs.com/reference.html#control-scale))
+    - [Attribution control](http://leafletjs.com/reference.html#control-attribution)
+    - [Loading control](https://github.com/ebrelsford/Leaflet.loading)
+ - Manage layers 
+    - [Tile provider](https://github.com/leaflet-extras/leaflet-providers)
+    - Markers - A set of [markers](http://leafletjs.com/reference.html#marker)
+    - Vectors - A set of [vectors](http://leafletjs.com/reference.html)
+    - Groups  - A group of layers
+    - Reference - A link to another layer
+ - Manage marker icons
+ - Manage vector styles
+ - Optional deferred ajax loading of layer data
+ - Integrates as frontend module and content element.
+ - Uses the GeoJSON format.
+ - Autoloading of required assets.
+ - [Layer for MetaModels](https://github.com/netzmacht/contao-leaflet-metamodels)
+ 
+Install
+-------
+
+```
+$ php composer.phar require netzmacht/contao-leaflet-maps:~1.0
+```
+
+Credits
+-------
+
+The integrated icons are part of the [Farm Fresh Web Icons](http://www.fatcow.com/free-icons) and are licensed under the
+[CC BY 3.0 US](http://creativecommons.org/licenses/by/3.0/us/)