Update README.md

README.md

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 The requirements for a Qlik Sense App Icon are:
 - Suitable format - ideally PNG file, but can be JPG, JPEG or GIF
-- Correct size or aspect - actual size is 168x108 pixels (although the help site says 8:5 - https://help.qlik.com/en-US/sense/June2019/Subsystems/Hub/Content/Sense_Hub/Apps/change-thumbnail-app.htm)
+- Correct size or aspect - actual size for the hub is 168x108 pixels (although the help site says 8:5 - https://help.qlik.com/en-US/sense/June2019/Subsystems/Hub/Content/Sense_Hub/Apps/change-thumbnail-app.htm, and in-app this is also different)
 
+# Usage
+
+This has been packaged as an extension, so just upload it under extensions in the QMC, then navigate to /extensions/AppIconBuilder/AppIconBuilder.html to create some icons.
+
+Note that prior to use, you'll need to configure the background image, and optionally font colours and sizes.
 
 # To do
 
-To do:
-* Add styling
-* Add config for opacity
-* Add config for source image (source, scaling, opacity)
+Current backlog:
+* Add config for source image (source, scaling, opacity) or for a single colour background
 * Add config for app name (font, colour, size, location)
-* Add integration with QRS API for auto population
-* Add wrapping for text
+* Add wrapping for app names
+* Add integration with QRS API for auto generation, and to allow pushing into a defined content library