start an overview of hausner class

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+* challenge-bot robot overview
+** videos for assembling the hardware
+** content
+*** software
+    software is available as nice neat installable packages for
+    Mac OS X, GNU+Linux, and MS Windows.
+
+    it's also available in source code form, so you can compile it for
+    other platforms.
+
+    all software used in this robot is available for you to use for any
+    purpose, improve, and, share those improvements (if you want).
+**** arduino
+***** summary
+      control how the robot gets information from sensors, and moves
+      its motors.
+***** download
+      https://www.arduino.cc/en/Main/Software
+**** openscad
+***** summary
+      create robot parts!
+**** fritzing
+     wire up components