Add ciris-cats module

[vlovgr]

Fixes #38.

[codecov]

Codecov Report

Merging #103 into 0.7.x will increase coverage by 0.25%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##            0.7.x     #103      +/-   ##
==========================================
+ Coverage   94.96%   95.22%   +0.25%     
==========================================
  Files          37       39       +2     
  Lines         596      628      +32     
  Branches        1        3       +2     
==========================================
+ Hits          566      598      +32     
  Misses         30       30

Impacted Files	Coverage Δ
...n/scala/ciris/cats/api/CatsInstancesForCiris.scala	100% <100%> (ø)
...n/scala/ciris/cats/api/CirisInstancesForCats.scala	100% <100%> (ø)

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