Introduction of labelled comments that use different colour

[Heime]

I would like to categorise comments using a label.  With the comment for the 
label
using a different colour than the usual colour for comments.

This would be different that using outlines as they do not represent a large 
section,
but some thing minor where categorising at a lower level is appropriate. 

  ;; [KM Principles]  <- Label (Define definition for a label)
  ;; Write the infinitive connectedly.
  ;; Omit the vowel, when `as' is repeated in a phrase.
  ;; Write figures to represent all numbers.