Add details regarding the new debugging workflow as specified [here](https://github.com/microsoft/vstest/pull/2325#discussion_r423896684) to the existing [RFC](https://github.com/microsoft/vstest-docs/pull/216/files#diff-fb0ba30e09566fc43521c71dcf5fb205)
Add details regarding the new debugging workflow as specified here to the existing RFC