[ros] Added yaml to ros package

ros/sot_talos_balance/yaml/half_sitting.yaml

+play_motion:
+  controllers: [right_arm_controller, left_arm_controller, left_leg_controller, right_leg_controller,
+    head_controller, torso_controller, gripper_left_controller, gripper_right_controller]
+  motions:
+    half_sitting:
+      joints: [leg_left_1_joint, leg_left_2_joint, leg_left_3_joint, leg_left_4_joint,
+        leg_left_5_joint, leg_left_6_joint, leg_right_1_joint, leg_right_2_joint,
+        leg_right_3_joint, leg_right_4_joint, leg_right_5_joint, leg_right_6_joint,
+        torso_1_joint, torso_2_joint, arm_left_1_joint, arm_left_2_joint, arm_left_3_joint,
+        arm_left_4_joint, arm_left_5_joint, arm_left_6_joint, arm_left_7_joint, arm_right_1_joint,
+        arm_right_2_joint, arm_right_3_joint, arm_right_4_joint, arm_right_5_joint,
+        arm_right_6_joint, arm_right_7_joint, head_1_joint, head_2_joint, gripper_right_joint,
+        gripper_left_joint]
+      points:
+      - positions: [ 0.0,  0.0, -0.411354,  0.859395, -0.448041, -0.001708,
+         0.0,  0.0, -0.411354,  0.859395, -0.448041, -0.001708,
+         0.0 ,  0.006761,
+         0.25847 ,  0.173046, -0.0002, -0.525366, 0.0, -0.0,  0.1, 
+        -0.25847 , -0.173046, 0.0002  , -0.525366, 0.0,  0.0,  0.1,
+         0.0, 0.0, 0.0, 0.0]
+        time_from_start: 5.0
+      meta:
+        name: Half Sitting
+        usage: posture
+        description: Starting position for the SoT.