docs(README): add React-Semantic.UI-Starter

[layershifter]

Add link to react-semantic.ui-starter

[codecov-io]

Codecov Report

Merging #1626 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1626   +/-   ##
=======================================
  Coverage   99.74%   99.74%           
=======================================
  Files         141      141           
  Lines        2398     2398           
=======================================
  Hits         2392     2392           
  Misses          6        6

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[levithomason]

I had considered this previously, but the project had some inconsistencies I'd like to have ironed out. I suppose it is better to add it now and work those out as we go.