Added pure m4 example
Added pure m4 example

github/linguist,yyx990803/linguist,JJ/linguist,pchaigno/linguist,meunierfrederic/octocatlinguist,jtbandes/linguist,R4PaSs/linguist,erkyrath/linguist,christop/linguist,stanhu/linguist,mwpastore/linguist,JJ/linguist,erkyrath/linguist,c-lipka/linguist,PsichiX/linguist,c-lipka/linguist,erkyrath/linguist,osorgin/linguist,meunierfrederic/octocatlinguist,PsichiX/linguist,christop/linguist,github/linguist,MahmoudFayed/linguist,JJ/linguist,mwpastore/linguist,github/linguist,MahmoudFayed/linguist,sebgod/linguist,jtbandes/linguist,yyx990803/linguist,pchaigno/linguist,meunierfrederic/octocatlinguist,steventhanna/linguist,R4PaSs/linguist,steventhanna/linguist,sebgod/linguist,sebgod/linguist,yyx990803/linguist,tschf/linguist,ppaulweber/github-linguist,stanhu/linguist,github/linguist,ppaulweber/github-linguist,MostAwesomeDude/linguist,erkyrath/linguist,JJ/linguist,stanhu/linguist,osorgin/linguist,sebgod/linguist,MostAwesomeDude/linguist,tschf/linguist,stanhu/linguist,pchaigno/linguist,yyx990803/linguist,pchaigno/linguist