fix(readme): add acknowledgement for material icons in tool plugins

[KhalilSelyan]

Description

This is related to #6351 , needed to add notice but PR was already closed so this one has been opened to continue the rest of it

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

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[yukkysaito]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e6df544) 14.86% compared to head (3e7d2eb) 14.86%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6354   +/-   ##
=======================================
  Coverage   14.86%   14.86%           
=======================================
  Files        1845     1845           
  Lines      126697   126659   -38     
  Branches    37883    37883           
=======================================
- Hits        18830    18828    -2     
+ Misses      86702    86665   -37     
- Partials    21165    21166    +1     

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (?)
total	14.86% <ø> (+<0.01%)	⬆️	Carriedforward from f646b2e

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

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