Add backload

WebCms/Backload/Imaging/readme.txt

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+To add backgrounds and watermarks to uploaded images, set the path in the 
+background/watermark attribute of the image element in Web.Backload.config
+Background images are only used in resize modes with canvas (fit, place)
+
+The provided background.png and watermark.png are examples only. You can 
+create your own images. PNG images can have an opacity value lower than 1. 
+
+Note: Background and watermark images are a Pro/Enterprise features, 
+while background color is a Standard feature
+
+
+
+
+Example:
+
+<backload xsi:noNamespaceSchemaLocation="Config\Web.Backload.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:name="urn:backload-schema">
+
+  <!-- Sets a resize mode, background, watermark and vertical watermark position -->
+  <images resizeMode="fit" background="~/Backload/Imaging/background.png" watermark="~/Backload/Imaging/watermark.png" watermarkPosition="bottom" />
+
+</backload>