Update README.md

Author: mmmago

README.md

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-# airslide
-Quick notch action to airdrop items
+<p align="center"> <img width="300" alt="airslide" src="https://user-images.githubusercontent.com/76073612/215763984-21cdb33c-b54d-4993-b697-eb90ea1a1a27.png"> <p>
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+# AirSlide
+Quick notch action to airdrop items. Free and open source alternative to [TopDrop](https://apps.apple.com/us/app/topdrop/id1630456052?mt=12).
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