Add background

[johnfercher]

Description

Related Issue

close #154

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

Attention: 26 lines in your changes are missing coverage. Please review.

Comparison is base (b5c4d0d) 31.69% compared to head (ccddd37) 31.60%.

Additional details and impacted files

@@            Coverage Diff             @@
##               v2     #324      +/-   ##
==========================================
- Coverage   31.69%   31.60%   -0.09%     
==========================================
  Files          20       19       -1     
  Lines         931      937       +6     
==========================================
+ Hits          295      296       +1     
- Misses        629      634       +5     
  Partials        7        7              

Flag	Coverage Δ
unittests	31.60% <50.00%> (-0.09%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
internal/code/code.go	87.50% <100.00%> (ø)
internal/math/math.go	100.00% <100.00%> (ø)
pkg/maroto.go	10.99% <100.00%> (ø)
pkg/repository/repository.go	90.91% <100.00%> (ø)
internal/signature.go	0.00% <0.00%> (ø)
internal/text.go	0.00% <0.00%> (ø)
pkg/components/col/col.go	31.25% <50.00%> (ø)
internal/line.go	0.00% <0.00%> (ø)
internal/image.go	0.00% <0.00%> (ø)
pkg/config/builder.go	56.10% <46.43%> (-2.99%)	⬇️

... and 1 file with indirect coverage changes

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