Put path to dotnet-new3.dll to global variables during the repo build #2521
Description
Previously it was possible to run 'dotnet new3' after building the repo locally without specifying exact path to dotnet-new3.dll assembly (it was mentioned in previous edition of readme.md), however this feature was lost, potentially with moving to new build script.
This feature is quite useful however, investigate if we can bring it back.
Once dotnet new3 is working, update readme.md file to reference it instead using full path.
Originally posted by @bozturkMSFT in #2518 (comment)