Add macstadium logo :)

Macstadium was nice enough to provide me a machine for me to start automating and testing this project on a M1 hardware.

Author: Bunn

README.md

@@ -30,3 +30,7 @@ If you want to run Pi Stats on your iPhone or iPad you can download [Pi Stats fo
 
 ## Download
 Pi Stats (and [SwiftHole](https://github.com/Bunn/SwiftHole)) is a free and open source hobby project of mine. If you want to support its development you can either pay whatever you want on [Gumroad](https://gum.co/iqhwv) or buy it on the [App Store](https://apps.apple.com/us/app/pi-stats/id1514075262?ls=1) for those nice automatic updates :)
+
+<p align="center">
+  <img width="100" src="./images/macstadium.png"">
+</p>