doc: Update README.md

Author: jaywcjlove

core/README.md

@@ -1,6 +1,7 @@
 <div markdown="1">
   <sup>Using <a href="https://wangchujiang.com/#/app" target="_blank">my app</a> is also a way to <a href="https://wangchujiang.com/#/sponsor" target="_blank">support</a> me:</sup>
   <br>
+  <a target="_blank" href="https://apps.apple.com/app/Keyzer/6500434773" title="Keyzer for macOS"><img alt="Keyzer" height="52" width="52" src="https://wangchujiang.com/appicon/keyzer.png"></a>
   <a target="_blank" href="https://github.com/jaywcjlove/vidwall-hub" title="Vidwall Hub for macOS"><img alt="Vidwall Hub" height="52" width="52" src="https://wangchujiang.com/appicon/vidwall-hub.png"></a>
   <a target="_blank" href="https://apps.apple.com/app/VidCrop/6752624705" title="VidCrop for macOS"><img alt="VidCrop" height="52" width="52" src="https://wangchujiang.com/appicon/vidcrop.png"></a>
   <a target="_blank" href="https://apps.apple.com/app/Vidwall/6747587746" title="Vidwall for macOS"><img alt="Vidwall" height="52" width="52" src="https://wangchujiang.com/appicon/vidwall.png"></a>