add comments

init/dot.emacs.el

@@ -1,3 +1,19 @@
+;;; dot.emacs  --- Summary
+;;;   This package will enable us to use multiple emacs startup
+;;;   configuration(startkit in this package) and switch between
+;;;   these configuration just by change a single environment
+;;;   variable (EMACS_STARTKIT).
+;;;
+;;;   Currently, we have test it with following:
+;;;   -  doom-emacs
+;;;   -  spacemacs
+;;;   -  frontmacs
+;;;   -  ohai-emacs
+;;;   -  graphene
+;;;   -  prelude
+;;;
+;;; Commentary:
+;;; Code:
 (require 'cl-lib)
 (require 'comint)