add-page

[johnfercher]

Description

• Add pages feature
• https://maroto.io/#/v2/features/addpage?id=addpage

Checklist

check with "x", if applied to your change

• All methods associated with structs has func (s *struct) method() {} name style.
• Wrote unit tests for new/changed features.
• Updated docs/doc.go
• Updated pkg/pdf/example_test.go
• Updated README.md
• Updated all examples inside internal/examples
• New public methods/structs/interfaces has comments upside them explaining they responsibilities
• Executed make dod with none issues pointed out by golangci-lint and goreportcard-cli

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (v2@fdbc63c). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@          Coverage Diff          @@
##             v2     #303   +/-   ##
=====================================
  Coverage      ?   27.74%           
=====================================
  Files         ?       17           
  Lines         ?      786           
  Branches      ?        0           
=====================================
  Hits          ?      218           
  Misses        ?      564           
  Partials      ?        4           

Flag	Coverage Δ
unittests	27.74% <0.00%> (?)

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