This is just the syntax highlighting, yes.

Installation

ELPA and MELPA

Package management via package.el is allowed (thanks to anuragm):

(use-package qsharp-mode
  :quelpa
  (qsharp-mode :fetcher github :repo "forked-from-1kasper/emacs-qsharp-mode")
  :commands qsharp-mode
  :mode (("\\.qs$" . qsharp-mode)))

Manual installation

1. Clone this repo to ~/.emacs.d/qsharp-mode/:

   git clone git://github.com/forked-from-1kasper/emacs-qsharp-mode`

2. Add the following to your init.el:

   (add-to-list 'load-path "~/.emacs.d/qsharp-mode/")
   (autoload 'qsharp-mode "qsharp-mode" "Major mode for editing Q# code." t)
   (add-to-list 'auto-mode-alist '("\\.qs$" . qsharp-mode))

3. ???

4. PROFIT!

Screenshot