Update Readme.md

Author: Gabriel-Lewis

README.md

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 # Air
+<img src="https://github.com/Gabriel-Lewis/Air/blob/master/Air/Assets.xcassets/AppIcon.appiconset/mac-512x512%402x.png" width="200" height="200" />
 Mac menu bar app to track Air Quality
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+<img src="https://ph-files.imgix.net/a8e19a3e-a4c4-4342-9858-4e2056b5cd53?auto=format&auto=compress&codec=mozjpeg&cs=strip&w=417.0731707317073&h=380&fit=max&dpr=2" />