add readme, fix launch remap

Signed-off-by: Takamasa Horibe <[email protected]>

control/trajectory_follower_nodes/design/simple_trajectory_follower-design.md

@@ -0,0 +1,24 @@
+# Simple Trajectory Follower
+
+## Purpose
+
+Provide a base trajectory follower code that is simple and flexible to use. This node calculates control command based on a reference trajectory and an ego vehicle kinematics.
+
+## Design
+
+### Inputs / Outputs
+
+Inputs
+
+- `input/reference_trajectory` [autoware_auto_planning_msgs::msg::Trajectory] : reference trajectory to follow.
+- `input/current_kinematic_state` [nav_msgs::msg::Odometry] : current state of the vehicle (position, velocity, etc).
+- Output
+- `output/control_cmd` [autoware_auto_control_msgs::msg::AckermannControlCommand] : generated control command.
+
+### Parameters
+
+| Name                    | Type  | Description                                                                                                        | Default value |
+| :---------------------- | :---- | :----------------------------------------------------------------------------------------------------------------- | :------------ |
+| use_external_target_vel | bool  | use external target velocity defined by parameter when true, else follow the velocity on target trajectory points. | false         |
+| external_target_vel     | float | target velocity used when `use_external_target_vel` is true.                                                       | 0.0           |
+| lateral_deviation       | float | target lateral deviation when following.                                                                           | 0.0           |

control/trajectory_follower_nodes/launch/simple_trajectory_follower.launch.xml

@@ -11,6 +11,6 @@
 
     <remap from="input/kinematics" to="/localization/kinematic_state"/>
     <remap from="input/trajectory" to="/planning/scenario_planning/trajectory"/>
-    <remap from="output/control_cmd" to="/simulation/input/manual_ackermann_control_command"/>
+    <remap from="output/control_cmd" to="/vehicle/command/manual_control_cmd"/>
   </node>
 </launch>