add description

readme.md

@@ -15,6 +15,14 @@
 | 4    | 7    | `joint_forces`       | 7 个关节受到的力                     |
 | 5    | 7    | `gripper_pose`       | 抓手在空间中的位姿（7 维表示方式）   |
 
+Task description：
+['put rubbish in bin',
+'drop the rubbish into the bin',
+'pick up the rubbish and leave it in the trash can',
+'throw away the trash, leaving any other objects alone',
+'chuck way any rubbish on the table rubbish']
+
+
 ## 示例
 
 ```python