add UmiJs demo

[qiujie8092916]

#3467 @ScriptedAlchemy

[vercel]

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[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ ScriptedAlchemy
❌ qiujie8092916
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[ScriptedAlchemy]

Ill get to it soon

[ScriptedAlchemy]

Great will take a look this week hopefully

[github-actions]

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[qiujie8092916]

Thanks a lot.Is there any progress now?

[ScriptedAlchemy]

Ill look at it tomorrow!