Add submission UI documentation from 2.0 submission

[nv-ananjappa]

Neither the /inference or the /inference_policies repo holds the submission UI usage documentation that Pablo had created and added into the private 2.0 submission repo. Could we pull that markdown into one of these repos so it is publicly visible for sharing and review well before the submission deadline? Or if you folks feel that it is general enough to cover both Training and Inference, then pull it upstream into the /policies repo?