I'm using this theme at the moment
Follow this steps:
$ mkdir xcode-themes && cd xcode-themes
$ git clone https://github.com/phynet/xcode-theme
$ mkdir -p ~/Library/Developer/Xcode/UserData/FontAndColorThemes/
$ cp *.xccolortheme ~/Library/Developer/Xcode/UserData/FontAndColorThemes/
The SF Mono font comes with Mac, but needs to be installed
/Applications/Utilities/Terminal.app/Contents/Resources/Fonts/
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Open "Font Book" app using spotlight.
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Select Add Fonts using + button and navigate to the fonts to add them to font book.
Adding the font https://www.jetbrains.com/lp/mono/ Mono 13pt with ligatures looks even better