This has not been packaged yet for installation via the MODX Extras Installer, but that's coming soon. For now you can copy the 4 files into their respective locations in your MODX install, create a MODX Plugin with the code from here, enable it for the events 'ContentBlocks_RegisterInputs' and 'OnManagerPageInit', and you should be good to go.
NOTE: this is only if you use the Content Blocks Premium Extra. In this repo is a copy of a Snippet that can be called into a MODX TV Input Options field (via @CHUNK Binding, for example) to endow a TV with the same functionality. For more info and some background, here's the original blog post on the Font Awesome Input for MODX.