Cannot Find Chrome Extension Manifest File

background I'm learning how to build a chrome extension app, and I'm following the instructions in this tutorial (you can see my code here). The instructions in the copy key to yo

Solution 1:

While working on unpacked version you can skip the step for adding the key to your manifest file, but be sure to add the oAuth key to the manifest file and also use the extension key while creating Credentials for the oAuth.

You can test your extension without uploading it on a webstore.