Command rename: create-model -> add-model

[Cheryl Jennings]

Hi Everyone,

Just a heads up that I'm merging a PR to rename the create-model command to
add-model to be more consistent in our terminology.

The next 2.0 release will contain this rename, and those of you building
from master will need to use add-model once the PR lands.

Thanks!
-Cheryl
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