Add dotnet core runtime to the dependencies section on docs

https://docs.microsoft.com/en-us/dotnet/core/install/runtime

changed milestone to %9.7

added DOC label

mentioned in merge request !411 (merged)

added flow::Merge Requested label

mentioned in commit c1f86a96

closed via merge request !411 (merged)

mentioned in merge request !413 (merged)

added QA Verified label

Dotnet core requirement has been added