Add license scan report and status

[fossabot]

Your FOSSA integration was successful! Attached in this PR is a badge and license report to track scan status in your README.

Below are docs for integrating FOSSA license checks into your CI:

• CircleCI
• TravisCI
• Jenkins
• Other

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This change is 

[codecov]

Codecov Report

Merging #10 into master will decrease coverage by 1.86%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
- Coverage   79.12%   77.26%   -1.87%     
==========================================
  Files          12       12              
  Lines         412      365      -47     
==========================================
- Hits          326      282      -44     
+ Misses         86       83       -3

Impacted Files	Coverage Δ
tests/CouponingApiSpecialProducts.php	44.44% <0%> (-10.11%)	⬇️
tests/CouponingApiUniversalProducts.php	44.44% <0%> (-10.11%)	⬇️
tests/CouponingNewApiUniversalProducts.php	37.5% <0%> (-9.87%)	⬇️
tests/CouponingNewApiSpecialProducts.php	37.5% <0%> (-9.87%)	⬇️
tests/CouponingApi.php	61.11% <0%> (-7.08%)	⬇️
tests/CouponingNewApi.php	58.82% <0%> (-7.04%)	⬇️
src/paris/orm/ORMWrapper.php	92.85% <0%> (-0.48%)	⬇️
tests/MockPDOStatement.php	100% <0%> (ø)	⬆️
src/paris/orm/Model.php	91.55% <0%> (+1.02%)	⬆️

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