Create versions_and_names.md (#2072)
Create versions_and_names.md (#2072)

Migrating this doc from Home repo.
https://github.com/microsoft/ApplicationInsights-Home/blob/master/EndpointSpecs/SDK-VERSIONS.md
pharring/ApplicationInsights-dotnet,pharring/ApplicationInsights-dotnet,Microsoft/ApplicationInsights-dotnet,pharring/ApplicationInsights-dotnet