Update README.md to correct link to .NET Foundation projects (#4411)
Update README.md to correct link to .NET Foundation projects (#4411)

Update README.md to correct link to .NET Foundation projects, because dotnet.github.io is pointing to dotnet.microsoft.com instead of dotnetfoundation.org project page.
imcarolwang/wcf,mconnew/wcf,dotnet/wcf,dotnet/wcf,mconnew/wcf,imcarolwang/wcf,mconnew/wcf,dotnet/wcf,imcarolwang/wcf