Add Screenshots title to README

README.md

@@ -13,6 +13,8 @@ Massive tracks your reps and sets at the gym. No internet connectivity or high s
   <img height="70" alt='Get it on Google Play' src='https://play.google.com/intl/en_us/badges/static/images/badges/en_badge_web_generic.png'/>
 </a>
 
+# Screenshots
+
 <img src="images/home.png" height="672"/>
 <img src="images/edit.png" height="672"/>
 <img src="images/timer.png" height="672"/>