Update README.md

Author: fcamas

Shared/Samples/Add web tiled layer/README.md

@@ -15,16 +15,19 @@ Run the sample and a map will appear. As you navigate the map, map tiles will be
 ## How it works
 
 Web tiled services use a uniform addressing scheme with pre-rendered tiles. Image tiles are accessed via a URL template string, with parameters for subdomain, level, column, and row.
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 * Subdomain is optional and allows the Maps SDK to balance requests among multiple servers for enhanced performance.
 * Level, row, and column select the tiles to load based on the visible extent of the map.
 
 To display the web tiled layer, this sample:
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 1. Creates a `WebTiledLayer` from a URL.
 2. Creates a new `Basemap` from the layer.
 3. Updates the attribution on the layer. Note: this is a necessary step because web tiled services don't have associated service metadata.
 4. Displays the basemap.
 
 For more information about web tiled layers, see the following resources:
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 * [Wikipedia: tiled web maps](https://en.wikipedia.org/wiki/Tiled_web_map)
 * [ArcGIS Pro: Share a web tile layer](http://pro.arcgis.com/en/pro-app/help/sharing/overview/web-tile-layer.htm)