repo-setup: how do we handle large files?

[emzudemo]

Is your feature request related to a problem? Please describe.
The Sketch file nearly exceeds the file size limit of 100mb on github.com

Describe the solution you'd like
I think we have to host large files (e.g. the sketch file) somewhere else in the future to keep the repo clean.

Describe alternatives you've considered
Maybe we can use this, but I don't know how exactly it works so I need help with the setup https://git-lfs.github.com/

Additional context
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[MalteRei]

Sounds good. I have not worked with git lfs. However, it seems like the right solution to that problem. Nevertheless, the repo will still contain the files. The way I understand lfs is that you just don't need to download all of them for each branch to your local machine.