Created Accounting API and stubs

[gbenziv]

xxxx

• Skeleton for accounting API
• Fixes #226

Pull Request Checklist

• [x] I have ensured that my commit message contains the Issue ID.
• [x] I have ensured that my commit message contains the feature/bugfix description.
• [ ] I have updated the documentation accordingly.
• [x] I have ensured my code follows the coding guidelines.
• [x] I have ran lint in my code locally prior to submission.
• [x] I have built my changes in local successfully.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #227 (6025391) into master (0fbfdcb) will decrease coverage by 1.32%. The diff coverage is 42.42%.

:exclamation: Current head 6025391 differs from pull request most recent head 072f640. Consider uploading reports for the commit 072f640 to get more accurate results

@@            Coverage Diff             @@
##           master     #227      +/-   ##
==========================================
- Coverage   95.42%   94.10%   -1.33%     
==========================================
  Files          63       63              
  Lines        1137     1153      +16     
==========================================
  Hits         1085     1085              
- Misses         52       68      +16     

Impacted Files	Coverage Δ
core/domain/accounting/salecomputer.hpp	100.00% <ø> (ø)
core/domain/unittest/test_salecomputer.cpp	100.00% <ø> (ø)
core/domain/accounting/accountingcontroller.cpp	19.04% <15.00%> (ø)
...in/unittest/mock/accounting/accountingdatamock.hpp	50.00% <50.00%> (ø)
core/domain/accounting/accountingcontroller.hpp	100.00% <100.00%> (ø)
...re/domain/accounting/interface/accountingiface.hpp	100.00% <100.00%> (ø)
core/domain/accounting/salecomputer.cpp	100.00% <100.00%> (ø)
...in/unittest/mock/accounting/accountingviewmock.hpp	100.00% <100.00%> (ø)
core/domain/unittest/test_accounting.cpp	100.00% <100.00%> (ø)
... and 1 more

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[gbenziv]

core/domain/common/types.hpp#L39 struct member 'TodaySalesSummary::targetDiffPercentage' is never used.

these unused variable is placed ahead and will be used by the dashboard APIs