Submit assignment 2 chat app

[JxZhang15]

What changes are you trying to make? (e.g. Adding or removing code, refactoring existing code, adding reports)

add code file and readme.md

What did you learn from the changes you have made?

how to design a basic chat box

Was there another approach you were thinking about making? If so, what approach(es) were you thinking of?

Were there any challenges? If so, what issue(s) did you face? How did you overcome it?

yes, got to revisit the videos and get helps from Gemini

How were these changes tested?

A reference to a related issue in your repository (if applicable)

Checklist

• I can confirm that my changes are working as intended

[github-actions]

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[JxZhang15]

sorry, i create a wrong pull request again. i will close it.