Add dependency of contao-leaflet-libraries

assets/leaflet-providers/README.md

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+Leaflet-providers
+=================
+An extension to [Leaflet](http://leafletjs.com/) that contains configurations for various free tile providers.
+
+# Usage
+Leaflet-providers [providers](#providers) are refered to with a `provider[.<variant>]`-string. Let's say you want to add the nice [Watercolor](http://maps.stamen.com/#watercolor/) style from Stamen to your map, you pass `Stamen.Watercolor` to the `L.tileLayer.provider`-constructor, which will return a [L.TileLayer](http://leafletjs.com/reference.html#tilelayer) instance for Stamens Watercolor tile layer.
+
+```Javascript
+// add Stamen Watercolor to map.
+L.tileLayer.provider('Stamen.Watercolor').addTo(map);
+```
+
+# Providers
+
+Leaflet-providers provides tile layers from different providers, including *OpenStreetMap*, *MapQuestOpen*, *Stamen*, *Esri* and *OpenWeatherMap*. The full listing of free to use layers can be [previewed](http://leaflet-extras.github.io/leaflet-providers/preview/index.html). The page will show you the name to use with `leaflet-providers.js` and the code to use it without dependencies.
+
+## Providers requiring registration
+
+In addition to the providers you are free to use, we support some layers which require registration.
+
+### HERE (formerly Nokia).
+
+In order to use HERE basemaps, you must [register](http://developer.here.com/get-started). With your `app_id` and `app_code` specified in the options. The available layers are:
+
+* HERE.normalDay
+* HERE.normalGreyDay
+* HERE.satelliteNoLabelsDay
+* HERE.satelliteYesLabelsDay
+* HERE.terrainDay
+
+For example:
+```Javascript
+L.tileLayer.provider('HERE.terrainDay', {
+    app_id: 'insert ID here',
+    app_code: 'insert ID here'
+}).addTo(map);
+```
+
+### Mapbox
+
+In order to use Mapbox maps, you must [register](https://tiles.mapbox.com/signup). If your user name is `YourName` and your map is called `MyMap` you can add it with
+```JavaScript
+L.tileLayer.provider('MapBox.YourName.MyMap');
+```
+
+### Esri/ArcGIS
+
+In order to use ArcGIS maps, you must [register](https://developers.arcgis.com/en/sign-up/) and abide by the [terms of service](https://developers.arcgis.com/en/terms/). Available layers are...
+
+* Esri.WorldStreetMap
+* Esri.DeLorme
+* Esri.WorldTopoMap
+* Esri.WorldImagery
+* Esri.WorldTerrain
+* Esri.WorldShadedRelief
+* Esri.WorldPhysical
+* Esri.OceanBasemap
+* Esri.NatGeoWorldMap
+* Esri.WorldGrayCanvas
+
+# Attribution
+
+This work was inspired from <https://gist.github.com/1804938>, and originally created by [Stefan Seelmann](https://github.com/seelmann).