How add a script that it is not on npmjs.com in sage9?

What are the correct steps to add a jquery script that it is not on www.npmjs.com?

I would like to install this https://github.com/pavelk2/social-feed but unfortunately it is not on npm.

any ideas how I can achieve this?

yarn add git+ssh://git@github.com:pavelk2/social-feed.git
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