Add macOS DMG download information

Added download link and note for macOS DMG installation.

Signed-off-by: Ettore Di Giacinto <mudler@users.noreply.github.com>

Author: mudler

docs/content/docs/getting-started/quickstart.md

@@ -31,10 +31,14 @@ See [Installer]({{% relref "docs/advanced/installer" %}}) for all the supported
 
 ### macOS Download
 
+For MacOS a DMG is available:
+
 <a href="https://github.com/mudler/LocalAI/releases/latest/download/LocalAI.dmg">
   <img src="https://img.shields.io/badge/Download-macOS-blue?style=for-the-badge&logo=apple&logoColor=white" alt="Download LocalAI for macOS"/>
 </a>
 
+> Note: the DMGs are not signed by Apple and shows quarantined after install. See https://github.com/mudler/LocalAI/issues/6268 for a workaround, fix is tracked here: https://github.com/mudler/LocalAI/issues/6244
+
 ### Run with docker
 
 {{% alert icon="💡" %}}