Add documentation for OneAnd

[markus1189]

Hi all, I wrote a quick introduction to the OneAnd data type. It is not especially fancy but it should at least give a brief overview and is better than an empty page ;)

I'd be happy to apply any additions / modifications, so let me know.

Best,
Markus

-- 24pullrequests

[ceedubs]

👍 thanks!

If #537 results in NonEmptyList having its own data type, we should try to remember to update these docs to omit "which is the actual implementation of non-empty lists in cats" :)

[codecov-io]

Current coverage is 85.01%

Merging #706 into master will not affect coverage as of b9320f2

@@            master    #706   diff @@
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  Files          162     162       
  Stmts         2229    2229       
  Branches        74      74       
  Methods          0       0       
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  Hit           1895    1895       
  Partial          0       0       
  Missed         334     334       

Review entire Coverage Diff as of b9320f2

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[adelbertc]

👍