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command not found to add repository for cobang for QR CODE READER on UBUNTU 20.04lts

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I am using UBUNTU 20.04 lts. When I add repository, the message comes like "COMMAND NOT FOUND" Can anyone tell how to add repository to install cobang application on ubuntu 20.04 lts.

(base) thilipkumar@thilipkumar-Inspiron-5520:~/Downloads$ sudo add-apt-repository ppa:ng-hong-quan/ppa
[sudo] password for thilipkumar: 
sudo: add-apt-repository: command not found

 
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