Install JSLim with npm:
Full installation instructions can be found here.
You can contribute to the Open-source by writing new JSlim classes. This is especially good opportunity for beginner to intermediate developers, since there will always be room for new ideas in JSlim, you won't have to familiarize yourself with an enormous amount of code before contributing and it requires creativity with code, not bug hunting or fixing grammatical errors in documentation, making contributing to this Open-source project a pleasant experience. You can read more about contributing to JSlim here