Add Carbon Period functionality

[gmhafiz]

Adds a simple Carbon Period functionality https://carbon.nesbot.com/docs/#api-period that only accepts

1. Start date
2. period in days
3. End date

It returns an array of Carbon.

[codecov]

Codecov Report

Merging #78 (8ab69d8) into master (ce063dd) will increase coverage by 0.27%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #78      +/-   ##
==========================================
+ Coverage   89.11%   89.39%   +0.27%     
==========================================
  Files           3        4       +1     
  Lines         634      641       +7     
==========================================
+ Hits          565      573       +8     
  Misses         44       44              
+ Partials       25       24       -1     

Impacted Files	Coverage Δ
carbon.go	90.21% <100.00%> (-0.25%)	⬇️
carbonPeriod.go	100.00% <100.00%> (ø)
translator.go	65.51% <100.00%> (+6.89%)	⬆️

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[gmhafiz]

I can definitely cover the two lines not covered by unit test

[rntdrts]

I can definitely cover the two lines not covered by unit test

Thank you for contributing @gmhafiz! 🙌 Everything else seems good to me, once that is done we will move this forward 🎉 💪