Chrome web the application could be with two things in hand and they are:
- One the manifest file in JSON format as (manifest.json).
- Then you need a web icon in PNG format.
To create a (.json) format file you need to have a text editor like notepad or any other text editor to write the codes in. and then a photo editing software to design a pic as an icon of the app.
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Also, check out the YouTube videos to get started.