features/add method to return pdf settings

[Fernando-hub527]

Description
Add method to core.maroto to return current pdf settings

Related Issue
#438

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

Attention: Patch coverage is 50.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 84.06%. Comparing base (cb26f0d) to head (6fc9743).

Files	Patch %	Lines
metricsdecorator.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #440      +/-   ##
==========================================
- Coverage   84.13%   84.06%   -0.06%     
==========================================
  Files          61       61              
  Lines        2110     2114       +4     
==========================================
+ Hits         1775     1777       +2     
- Misses        308      310       +2     
  Partials       27       27              

Flag	Coverage Δ
unittests	84.06% <50.00%> (-0.06%)	⬇️

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[lordofscripts]

Is there anywhere a description how this affects applications without having to examine the commits?