Copy helm-template-mode.el
into ~/.emacs.d/local/helm-template-mode
and
put the following into your .emacs
config:
(add-to-list 'load-path "~/.emacs.d/local/helm-template-mode/")
(require 'helm-template-mode)
(add-to-list 'auto-mode-alist '("/templates/.+\\.yaml\\'" . helm-template-mode))
(add-to-list 'auto-mode-alist '("/templates/.+\\.tpl\\'" . helm-template-mode))