Hi, I would like to add some open-source retro console emulators into my project, and wondering how this can be done.
I have started reading some documentation, but any advices would be appreciated 
Nice! Yes a plugin would be a good way to go - you can include all the needed open-source code to that… From the UE editor, go to Edit->PlugIns and then “+ Add” top/left to add a new Plugin to your project, in the window that opens, scroll to the bottom for “Third Party Library”.