Add sdk to global.json
Add sdk to global.json

alexmcmillan/graphql-dotnet,joemcbride/graphql-dotnet,graphql-dotnet/graphql-dotnet,dNetGuru/graphql-dotnet,alexmcmillan/graphql-dotnet,graphql-dotnet/graphql-dotnet,dNetGuru/graphql-dotnet,graphql-dotnet/graphql-dotnet,joemcbride/graphql-dotnet