Add icon for macOS

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diff --git a/data/icons/macos/README.md b/data/icons/macos/README.md
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+# App icon on macOS
+
+Qt Docs: [Setting the Application Icon on macOS](https://doc.qt.io/qt-5/appicon.html#setting-the-application-icon-on-macos)
+
+**qtmips_qui.svg** icon is exported using [Affinity Designer](https://affinity.serif.com/en-gb/designer/)
+in **all required dimensions together with the manifest for the Apple iconutil**. Export config and the icon are saved in `qtmips_qui.afdesign`.
+
+## Steps to generate macOS icon
+
+Requirements: macOS with XCode (iconutil)
+
+1. Open **qtmips_qui.afdesign** in [Affinity Designer](https://affinity.serif.com/en-gb/designer/).
+2. Switch to the **Export Persona** and run **Export Slices**.
+	You will be asked to select export folder.
+	In that folder, **icon.iconset** folder will be created.
+	**icon.iconset** contains rendered icons for all required dimensions together with the **Contents.json manifest** file.
+3. Generate **qtmips_qui.icns** using Apple's `iconutil` _(supply the correct path to the previously created icon.iconset):_
+	```bash
+	iconutil iconutil --convert icns --output qtmips_qui.icns icon.iconset
+	```
+	**Few caveats**:
+	- Iconset folder must have **.iconset** extension. Otherwise icontuil fails with error: _Invalid Iconset._
+	- Names of icons in Iconset must start with icon_ (case sensitive). Otherwise icontuil fails with error: _Failed to generate ICNS._
+4. Copy generated qtmips_qui.icns to project's `data/icons/macos/qtmips_qui.icns`.
+5. Finally copy `data/icons/macos/qtmips_qui.icns` to `qtmips_qui/icons/qtmips_qui.icns`
+	
+**Note:** [Affinity Designer](https://affinity.serif.com/en-gb/designer/) is not required. It is possible to create .iconset folder with the icons manually.
+However, it is good idea to automatize the .iconset creation (i.e. use Affinity Designer or other tools).
+
+
+
diff --git a/data/icons/macos/qtmips_gui.afdesign b/data/icons/macos/qtmips_gui.afdesign
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+++ b/data/icons/macos/qtmips_gui.afdesign
diff --git a/data/icons/macos/qtmips_qui.icns b/data/icons/macos/qtmips_qui.icns
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index 0000000..71b8433
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+++ b/data/icons/macos/qtmips_qui.icns