Added go 1 and go 1 velocity tracking example

UnitreeGo1/metadata.yaml

@@ -0,0 +1,23 @@
+Name: "Unitree Go1"
+Category: Robots
+Description: >
+  A detailed quadruped robot asset pack for the Unitree Go1 platform,
+  including STL geometry for major leg and body links, plus ready-to-use
+  configuration, scene, and graph assets.
+Tags:
+  - robot
+  - quadruped
+  - unitree
+  - go1
+Files:
+  - 'UnitreeGo1/Agents/UnitreeGo1Agent.cs'
+  - 'UnitreeGo1/assets/calf.stl'
+  - 'UnitreeGo1/assets/hip.stl'
+  - 'UnitreeGo1/assets/thigh.stl'
+  - 'UnitreeGo1/assets/thigh_mirror.stl'
+  - 'UnitreeGo1/assets/trunk.stl'
+  - 'UnitreeGo1/go1.png'
+  - 'UnitreeGo1/go1.xml'
+  - 'UnitreeGo1/MG_Velocity.hmograph'
+  - 'UnitreeGo1/scene.xml'
+