What would be the value of this public key how to get that or generate that?
This publickey is generated client side using libsodium by the user. You just need to click on the " 
Generate" button in this case that you can see on your screenshot from Remix.
I thought only clicking is okay, but when I click to it. It generates nothing.
what is name this app?
This is nothing just testing a smart contract,that is also taken from ZAMA website.
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Could I have a time from you to discuss?