Ok, lets make things simple. First of all,based on my understanding, in order to create a Google chrome app/extension. It is just like build a html website and package it with manifest.json files.
In Google chrome app/extension. It's just need a file with
- a manifest.json file
- a .html file
- a .css file
- a. javascript file (can also include jQuery inside javascript)
So,lets start. All you need is ideas,a Chrome web browser and a text editor.
1. Create a folder to save all your files inside. Can put anywhere,make sure you remember it. Prefer to put it in Desktop(for windows). Like me,i create in Home folder in Ubuntu/Linux. So,name anything for your folder. Like me,i create a folder called "chrome app".