yaml-mode-setup.el

(ensure-package-installed 'yaml-mode)

(require 'yaml-mode)
(add-to-list 'auto-mode-alist '("\\.yml\\'" . yaml-mode))

(add-hook 'yaml-mode-hook
	  '(lambda ()
	     (define-key yaml-mode-map "\C-m" 'newline-and-indent)))

(add-hook 'yaml-mode-hook (lambda ()
			    (require 'ws-butler)
			    (ws-butler-mode)))