Updated Frequently asked Questions Common Questions (markdown)

Frequently-asked-Questions--Common-Questions.md

@@ -41,6 +41,7 @@ double GetElapsed(Timer timer)
     return GetTime() - timer.StartTime;
 }
 ```
+You can see a short video on the concept here. https://youtu.be/vGlvTWUctTQ
 
 # What do all the fields in Camera2d mean?