Chat app with postgres and java

Hello, I have a java task. Need help build a chatapp. All instructions are given in the file attached. I am also attaching a sample of it. please check the link for sample. Check the file for project and let me know. I need it done in 20 hrs. pls let me know how much u will charge me.

This example for the project: https://drive.google.com/file/d/1vdKzd5vQEtR_9KCQ-ac5E_ndt44gHAd0/view

Attached file to this message has all project details.

Thanks