api21_icon.md in headdesk-0.10.0

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 ## Reason
 Android 5+ uses [Material Design](https://material.io/design/iconography/#notification) and needs a white and transparant icon for proper display of notification icons in the tray.
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+## Resolution
+**Adobe AIR:** [Set Notification Icons for your Game](https://teak.readthedocs.io/projects/air/en/latest/android.html#set-notification-icons-for-your-game)
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+**Unity:** [Set Notification Icons for your Game](https://teak.readthedocs.io/projects/unity/en/latest/android.html#set-notification-icons-for-your-game)