更新图层说明

@@ -50,3 +50,24 @@ GeoQ地图层
   - AMAP_IMAGE，高德影像图层（不含路网，不含注记）
   - AMAP_ROAD，高德路网图层（含路网，含注记）
   - AMAP_TRAFFIC，高德实时交通图层
+
+
+## 基本用法
+
+天地图2000
+```
+t_vec = new TianDiTuTiledMapServiceLayer(TianDiTuLayerTypes.VEC_C);
+mapView.addLayer(t_vec);
+Point initPoint = new Point(121.56, 29.862149);
+mapView.zoomToResolution(initPoint, t_vec.getRes()[16]);
+```
+
+其它
+```
+TencentMapsTiledServiceLayer tencentMapsTiledServiceLayer = new TencentMapsTiledServiceLayer(TencentMapLayerTypes.TENCENT_MAP_VECTOR);
+mapView.addLayer(tencentMapsTiledServiceLayer);
+// 经纬度坐标要换成web墨卡托
+Point pt = GISHelper.lonLat2Mercator(AppInfo.initPoint);
+mapView.zoomToResolution(pt, tencentMapsTiledServiceLayer.getRes()[16]);
+
+```
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