Add readme.

README.md

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+Leaflet geocode widget
+======================
+
+This extension provides an widget to pick coordinates from a map. It uses the leaflet framework.
+
+
+Requirements
+------------
+
+Contao 4.3
+
+
+Install
+-------
+
+### 1. Install using composer
+
+```bash
+php composer.phar require netzmacht/contao-leaflet-geocode-widget
+
+```
+
+### 2. Update your AppKernel.php
+
+```php
+
+  // Dependency is automatically installed and has to be registered
+  new Contao\CoreBundle\HttpKernel\Bundle\ContaoModuleBundle('leaflet-libs', $this->getRootDir()),
+  
+  // Register the bundle
+  new Netzmacht\Contao\Leaflet\GeocodeWidget\LeafletGeocodeWidgetBundle(),
+```
+
+### 3. Update the assets
+
+```bash
+bin/console assets:install --symlink
+```
+
+### 4. Use the widget
+
+```php
+$GLOBALS['TL_DCA']['tl_example']['fields']['coordinates'] = [
+    'label'     => ['Koordinaten', 'Geben Sie die Koordinaten ein'],
+    'inputType' => 'leaflet_geocode',
+    'eval'      => [
+        'tl_class' => 'w50 wizard',
+    ],
+    'sql' => 'varchar(255) NOT NULL default \'\''
+];
+```