@trivial - update readme

[mhaack]

Description

Update readme with new AEM Commerce Add-On details

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [ ] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes and the overall coverage did not decrease.
• [ ] All unit tests pass on CircleCi.
• [ ] I ran all tests locally and they pass.

[codecov[bot]]

Codecov Report

Merging #169 (a4ae120) into master (bedc304) will increase coverage by 37.30%. The diff coverage is n/a.

@@              Coverage Diff              @@
##             master     #169       +/-   ##
=============================================
+ Coverage     50.39%   87.69%   +37.30%     
- Complexity      259      528      +269     
=============================================
  Files            38       38               
  Lines          2008     2008               
  Branches        317      317               
=============================================
+ Hits           1012     1761      +749     
+ Misses          833      104      -729     
+ Partials        163      143       -20     

Flag	Coverage Δ	Complexity Δ
integration	46.80% <ø> (ø)	259.00 <ø> (ø)
karma	96.55% <ø> (ø)	0.00 <ø> (ø)
unittests	84.05% <ø> (?)	512.00 <ø> (?)

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

Impacted Files	Coverage Δ	Complexity Δ
...cq/commerce/graphql/resource/CategoryResource.java	93.10% <0.00%> (+3.44%)	9.00% <0.00%> (ø%)
...erce/graphql/resource/GraphqlResourceProvider.java	88.23% <0.00%> (+5.88%)	12.00% <0.00%> (ø%)
...be/cq/commerce/graphql/magento/GraphqlQueries.java	98.03% <0.00%> (+7.84%)	18.00% <0.00%> (+1.00%)
...rce/graphql/resource/CategoryProductsIterator.java	96.29% <0.00%> (+11.11%)	12.00% <0.00%> (+2.00%)
.../cq/commerce/graphql/resource/ProductResource.java	90.00% <0.00%> (+15.00%)	16.00% <0.00%> (+6.00%)
...ommerce/graphql/resource/RootCategoryResource.java	95.00% <0.00%> (+15.00%)	9.00% <0.00%> (+2.00%)
...e/renderconditions/IsProductDetailPageServlet.java	85.71% <0.00%> (+16.32%)	14.00% <0.00%> (+4.00%)
...mmerce/graphql/core/GraphqlProductViewHandler.java	80.13% <0.00%> (+16.55%)	18.00% <0.00%> (+6.00%)
...a/impl/CatalogDataResourceProviderManagerImpl.java	80.84% <0.00%> (+18.22%)	44.00% <0.00%> (+14.00%)
...e/cq/commerce/graphql/resource/ResourceMapper.java	74.31% <0.00%> (+21.10%)	22.00% <0.00%> (+7.00%)
... and 21 more

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