This is a Sublime Text package which includes a bunch of handy snippets for doing KnockoutJS development.
If you have the Package Control package installed, you can install KnockoutJS Snippets from inside Sublime Text itself. Open the Command Palette and select "Package Control: Install Package", then search for KnockoutJS Snippets.
It's just that simple!
If you haven't got Package Control installed (seriously, go install it!) you will need to make a clone of this repository into your packages folder, like so:
git clone https://github.com/aaronpowell/Sublime-KnockoutJS-Snippets.git KnockoutJS-Snippets