docs(planning_debug_tools): rename readme to README

[TakaHoribe]

Description

rename readme

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

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[github-actions]

Documentation URL: https://autowarefoundation.github.io/autoware.universe/pr-4222/
Modified URLs:

• https://autowarefoundation.github.io/autoware.universe/pr-4222/planning/planning_debug_tools/

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (a0b0227) 15.93% compared to head (2ad1dae) 15.93%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4222   +/-   ##
=======================================
  Coverage   15.93%   15.93%           
=======================================
  Files        1580     1580           
  Lines      108921   108921           
  Branches    33612    33612           
=======================================
  Hits        17358    17358           
  Misses      72948    72948           
  Partials    18615    18615           

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (?)
total	15.93% <ø> (ø)		Carriedforward from a0b0227

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

Files Changed	Coverage Δ
...tion/traffic_light_map_based_detector/src/node.cpp	0.00% <ø> (ø)

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