docs(operation_transition_manager): update readme

[TakaHoribe]

Description

Add images for the operation_transition_manager

Tests performed

None

Effects on system behavior

None

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[codecov]

Codecov Report

Patch coverage: 20.71% and project coverage change: +0.06% 🎉

Comparison is base (3a370d4) 15.10% compared to head (c81753c) 15.16%.
Report is 47 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4888      +/-   ##
==========================================
+ Coverage   15.10%   15.16%   +0.06%     
==========================================
  Files        1577     1578       +1     
  Lines      108587   108606      +19     
  Branches    33339    33368      +29     
==========================================
+ Hits        16398    16470      +72     
+ Misses      74312    74222      -90     
- Partials    17877    17914      +37     

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (?)
total	15.17% <20.71%> (+0.07%)	⬆️	Carriedforward from 26086bf

*This pull request uses carry forward flags. Click here to find out more.

Files Changed	Coverage Δ
control/autonomous_emergency_braking/src/node.cpp	0.00% <ø> (ø)
.../lane_departure_checker/lane_departure_checker.hpp	0.00% <ø> (ø)
.../mpc_lateral_controller/mpc_lateral_controller.hpp	33.33% <0.00%> (-33.34%)	⬇️
control/mpc_lateral_controller/src/mpc.cpp	46.73% <ø> (ø)
control/mpc_lateral_controller/src/mpc_utils.cpp	50.44% <ø> (ø)
...ol/operation_mode_transition_manager/src/state.cpp	0.00% <ø> (ø)
...tudinal_controller/pid_longitudinal_controller.hpp	28.57% <ø> (ø)
...c/pure_pursuit/pure_pursuit_lateral_controller.cpp	0.00% <0.00%> (ø)
...y_follower_node/src/simple_trajectory_follower.cpp	0.00% <ø> (ø)
control/vehicle_cmd_gate/src/vehicle_cmd_gate.hpp	0.00% <ø> (ø)
... and 33 more

... and 10 files with indirect coverage changes

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[tkimura4]

LGTM