Added link to video of wave propagation in simple 2D intro example.

docs/source/examples_simple_2D.rst

@@ -123,6 +123,8 @@ You should have produced an output file ``cylinder_Ascan_2D.out``. You can view
 
     Electric and magnetic field components and currents outputs from a model of a metal cylinder buried in a dielectric half-space.
 
+Check out a `video of the field propagation in this example <https://youtu.be/BpBo0-SFda4>`_. More videos are screencasts can be found in the :ref:`screencasts section <screencasts>`.
+
 
 B-scan from a metal cylinder
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