updating readme on addHandler for hooks

[jaredwray]

fixes #1114

Please check if the PR fulfills these requirements

• Followed the Contributing guidelines.
• Tests for the changes have been added (for bug fixes/features) with 100% code coverage.
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
updating readme on addHandler for hooks for #1114

[codecov]

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Additional details and impacted files

@@           Coverage Diff            @@
##             main     #1116   +/-   ##
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  Coverage        ?   100.00%           
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  Files           ?        15           
  Lines           ?        67           
  Branches        ?         0           
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  Hits            ?        67           
  Misses          ?         0           
  Partials        ?         0           

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