Create a folder at this path if it doesn't exist already: ~/Library/Developer/Xcode/UserData/FontAndColorThemes Copy the .xccolortheme file into the above folder.
Download the latest release of Source Code Pro from its repo. Unzip the font archive and move the files in the TTF folder to ~/Library/Fonts.
based on "Solarized": https://ethanschoonover.com/solarized/