complete documentation

Author: DantSu

README.md

@@ -20,7 +20,30 @@ Create a empty image, draw on it and display it :
 
 ```php
 use \DantSu\OpenStreetMapStaticAPI\OpenStreetMap;
+use \DantSu\OpenStreetMapStaticAPI\LatLng;
+use \DantSu\OpenStreetMapStaticAPI\Line;
+use \DantSu\OpenStreetMapStaticAPI\Markers;
+
+header('Content-type: image/png');
+(new OpenStreetMap(new LatLng(44.351933, 2.568113), 18, 600, 400))
+    ->addMarkers(
+        (new Markers(__DIR__ . '/resources/marker.png'))
+            ->addMarker(new LatLng(44.351933, 2.568113))
+    )
+    ->addLine(
+        (new Line('FF0000', 2))
+            ->addPoint(new LatLng(44.351172, 2.571092))
+            ->addPoint(new LatLng(44.352097, 2.570045))
+            ->addPoint(new LatLng(44.352665, 2.568107))
+            ->addPoint(new LatLng(44.352887, 2.566503))
+            ->addPoint(new LatLng(44.352806, 2.565972))
+            ->addPoint(new LatLng(44.351517, 2.565672))
+            ->addPoint(new LatLng(44.351172, 2.571092))
+    )
+    ->getImage()
+    ->displayPNG();
 ```
+![Exported OpenStreetMap image](./src/samples/resources/sample1.png)
 
 ## Documentation