feat(autonomous_emergency_braking): add aeb document

[purewater0901]

Description

Add the Autonomous emergency braking package document (README).

Related links

Tests performed

Notes for reviewers

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.71 ⚠️

Comparison is base (49722f9) 13.02% compared to head (bc6ea98) 12.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3171      +/-   ##
==========================================
- Coverage   13.02%   12.31%   -0.71%     
==========================================
  Files        1251     1340      +89     
  Lines       88446    93506    +5060     
  Branches    26777    26774       -3     
==========================================
- Hits        11517    11516       -1     
- Misses      64766    69832    +5066     
+ Partials    12163    12158       -5     

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (?)
total	12.31% <ø> (-0.71%)	⬇️	Carriedforward from c11737c

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

Impacted Files	Coverage Δ
..._controller/include/mpc_lateral_controller/mpc.hpp	46.66% <ø> (ø)
control/mpc_lateral_controller/src/mpc.cpp	48.44% <ø> (ø)
control/mpc_lateral_controller/src/mpc_utils.cpp	57.00% <ø> (-0.01%)	⬇️

... and 115 files with indirect coverage changes

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