Made further improvements in the solution per the comments below #4
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I added a test library project in .net standard 1.6 but I could not make Nunit work in it. We can look into this non-urgent matter later on. The original test project exhibited compile issues on appveyor's CI server that I addressed it. I also added a YML file in case you'd like to get your own appveyor's account setup to have it compile this solution. Some tests do not pass in CI on appveyor, so I had to turn them off to get "passing" compile status. I also added version info and the status badge in the README markdown.