If you are using Mac OS and If you are a developer, chances are that you will be often using QuickLook in the finder to preview file contents.

However you should have noticed that QuickLook will not let you preview plain text files without a file extension like

README
INSTALL
Capfile
CHANGELOG
etc...

If you need to preview such files, you can install a QuickLook plugin called QLStephen.

Install QLStephen using Homebrew:

Open your Terminal and run

brew cask install qlstephen

Install QLStepen using MacPorts:

port install qlstephen