Add rst file for image gallery

doc/source/image_gallery.rst

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+.. raw:: latex
+
+   \clearpage
+
+.. |nbspc| unicode:: U+00A0 .. non-breaking space
+
+.. ADDING YOUR VIDEOS
+.. Embed YouTube videos changing the width to 30% and deleting the height
+.. Follow the format below creating a unique alias for your video
+
+.. |Feathern1| raw:: html
+
+    <iframe width="30%"  src="https://www.youtube.com/embed/3iRggdo3i0I" frameborder="0" allow="accelerometer;  encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+
+.. |Feathern2| raw:: html
+
+    <iframe width="30%" src="https://www.youtube.com/embed/1KArtuLYUmY" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+
+.. |Feathern3| raw:: html
+
+    <iframe width="30%" src="https://www.youtube.com/embed/OUICRNiFhpU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+
+Image Gallery
+=============
+
+
+Rotating
+--------
+.. ADD A URL so the link will print in the pdf version since the videos do not
+
+.. raw:: latex
+
+    \url{https://www.youtube.com/embed/3iRggdo3i0I}
+    \url{https://www.youtube.com/embed/1KArtuLYUmY}
+    \url{https://www.youtube.com/embed/OUICRNiFhpU}
+
+.. Place videos 3 across separated by 2 non-breaking white space.
+.. Insert a blank line between rows.
+
+|Feathern1|  |nbspc| |nbspc| |Feathern2| |nbspc| |nbspc| |Feathern3|