Add icon, fully qualify App

Author: MartinZikmund

ProjectHeads/AllComponents/Uno/Assets/Icons/icon.svg

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+# Shared Assets
+
+See documentation about assets here: https://github.com/unoplatform/uno/blob/master/doc/articles/features/working-with-assets.md
+
+## Here is a cheat sheet
+
+1. Add the image file to the `Assets` directory of a shared project.
+2. Set the build action to `Content`.
+3. (Recommended) Provide an asset for various scales/dpi
+
+### Examples
+
+```text
+\Assets\Images\logo.scale-100.png
+\Assets\Images\logo.scale-200.png
+\Assets\Images\logo.scale-400.png
+
+\Assets\Images\scale-100\logo.png
+\Assets\Images\scale-200\logo.png
+\Assets\Images\scale-400\logo.png
+```
+
+### Table of scales
+
+| Scale | WinUI       | iOS | Android |
+|-------|:-----------:|:---------------:|:-------:|
+| `100` | scale-100   | @1x             | mdpi    |
+| `125` | scale-125   | N/A             | N/A     |
+| `150` | scale-150   | N/A             | hdpi    |
+| `200` | scale-200   | @2x             | xhdpi   |
+| `300` | scale-300   | @3x             | xxhdpi  |
+| `400` | scale-400   | N/A             | xxxhdpi |