update readme add video clips and pictures

README.md

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-A ROS driver for a 12 DOF quadruped robot.
-![](https://github.com/zlingkang/quadruped_9g/blob/master/picture.png?raw=true)
+# A ROS driver for a 12 DOF quadruped robot.
+
+Project page: [http://zlethic.com/quadruped-9g/](http://zlethic.com/quadruped-9g/)
+![](http://i2.wp.com/zlethic.com/wp-content/uploads/2018/07/Screenshot-from-2018-07-07-00-24-52.png?w=640)
+
+![](http://i0.wp.com/raw.githubusercontent.com/zlingkang/quadruped_9g/master/picture.png?w=640&ssl=1)
+
+## Inverse Kinematics
+[![IMAGE ALT TEXT HERE](http://img.youtube.com/vi/ixWFk6L31cA/0.jpg)](http://www.youtube.com/watch?v=ixWFk6L31cA)
+[![IMAGE ALT TEXT HERE](http://img.youtube.com/vi/bPTbQGspkdM/0.jpg)](http://www.youtube.com/watch?v=bPTbQGspkdM)
+
+## Walk
+[![IMAGE ALT TEXT HERE](http://img.youtube.com/vi/jPd1owrN_ek/0.jpg)](http://www.youtube.com/watch?v=jPd1owrN_ek)
+[![IMAGE ALT TEXT HERE](http://img.youtube.com/vi/Z4MtLuWD0jU/0.jpg)](http://www.youtube.com/watch?v=Z4MtLuWD0jU)
+[![IMAGE ALT TEXT HERE](http://img.youtube.com/vi/Z3Jyw93fZR0/0.jpg)](http://www.youtube.com/watch?v=Z3Jyw93fZR0)