Update build instructions to beta3 and add test run steps
Update build instructions to beta3 and add test run steps

twsouthwick/dotnet-apiport,mjrousos/dotnet-apiport-old,twsouthwick/dotnet-apiport,JJVertical/dotnet-apiport,Microsoft/dotnet-apiport,mjrousos/dotnet-apiport,mjrousos/dotnet-apiport,Microsoft/dotnet-apiport,conniey/dotnet-apiport,JJVertical/dotnet-apiport,Microsoft/dotnet-apiport,conniey/dotnet-apiport,conniey/dotnet-apiport