Added short instruction for obtaining respond.js in example HTML code (see description).
Added short instruction for obtaining respond.js in example HTML code (see description).

BS3 commit 21be3efad3b1392ebc15acf082cbf3ae83437420

mozillo/todc-bootstrap,up2vs/todc-bootstrap,todc/todc-bootstrap,aaroncnhk/todc-bootstrap,ztx1491/todc-bootstrap,todc/todc-bootstrap,2947721120/googlebt4,todc/todc-bootstrap,2947721120/todc-bootstrap