Update README.md

README.md

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-license: bsd-3-clause
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+# unitree_model
+
+This is a repository providing Unitree's robot 3D models for different environments.
+
+For more information about robots model, please visit [unitree_ros](https://github.com/unitreerobotics/unitree_ros).
+
+
+## Generate from urdf
+
+Please follow [import_urdf tutorial](https://docs.isaacsim.omniverse.nvidia.com/4.5.0/robot_setup/import_urdf.html#getting-started) to convert URDF. 
+Due to some bugs in the python script in version 4.5, please use `Direct Import`.
+
+Specify the settings as follows:
+- Select **Movebale Base** in Links
+- Select **Stiffness** in Joint Configuration
+- Select **Force** in Drive Type
+- **Allow Self-Collision**