features/Provide method to define keyword

[Fernando-hub527]

Description
Provide a method in the builder to allow the configuration of keywords

Related Issue
#419

Checklist

check with "x", ONLY IF APPLIED to your change

• All methods associated with structs has func (<first letter of struct> *struct) method() {} name style.
• Wrote unit tests for new/changed features.
• Followed the unit test when,should naming pattern.
• All mocks created with m := mocks.NewConstructor(t).
• All mocks using m.EXPECT().MethodName() method to mock methods.
• Updated docs/doc.go and docs/*
• Updated example_test.go.
• Updated README.md
• Executed make examples to update all examples inside docs/examples.
• New public methods/structs/interfaces has comments upside them explaining they responsibilities
• Executed make dod with none issues pointed out by golangci-lint

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.13%. Comparing base (04ee0dd) to head (0c7955e).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #439      +/-   ##
==========================================
+ Coverage   84.05%   84.13%   +0.09%     
==========================================
  Files          61       61              
  Lines        2099     2110      +11     
==========================================
+ Hits         1764     1775      +11     
  Misses        308      308              
  Partials       27       27              

Flag	Coverage Δ
unittests	84.13% <100.00%> (+0.09%)	⬆️

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