Update quick-start.md

Author: juntao

doc/docs/quick-start.md

@@ -7,6 +7,8 @@ sidebar_position: 2
 This guide walks you through setting up your **EchoKit**, which comes pre-assembled and ready to use.  
 If you are using **EchoKit DIY Edition**, please refer to the flashing guide before continuing.
 
+If you would like to get a preview before your EchoKit device arrives, you can use our [web-base EchoKit device simulator](https://echokit.dev/chat/resources/).
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 ## Step 1: Connect EchoKit to Your Computer