Add recommendation for Source Code Pro font

Author: greimers

README.md

@@ -10,6 +10,8 @@ Currently the theme is only available for XCode but support for Tincta and Visua
 Copy the `xcolortheme` theme files to the folder `~/Library/Developer/Xcode/UserData/FontAndColorThemes`.
 If the `UserData` or `FontAndColorThemes` folders do not exist, just create them manually.
 
+# Font
+While you can use the Gabman Theme with any font you like, [Source Code Pro](https://github.com/adobe-fonts/source-code-pro) is recommended.
 
 # Contribution
 If you adjusted the Gabman Theme for your favorite editor, you are welcome to create a pull request with the added theme files.