Updated instructions how to start a container

00_GettingStarted/README.md

@@ -123,6 +123,8 @@ Follow the instructions to download the repository to your local machine and sta
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     <figure class="video_container">
     <video controls="true" allowfullscreen="true" poster="images/docker_exec_rosContainer.png">
+        <source src="images/docker_exec_rosContainer_video" type="video/mp4">
+        <source src="images/docker_exec_rosContainer_video.ogg" type="video/ogg">
         <source src="images/docker_exec_rosContainer_video.webm" type="video/webm">
     </video>
     </figure>