IUserService
Represents the user API service.
Adds the [User](https://relativitydev.github.io/relativity.testing.framework/api/Relativity.Testing.Framework.Models.User.html) to the group.
Creates the specified [User](https://relativitydev.github.io/relativity.testing.framework/api/Relativity.Testing.Framework.Models.User.html).
Deletes the [User](https://relativitydev.github.io/relativity.testing.framework/api/Relativity.Testing.Framework.Models.User.html) by ArtifactID.
Determines whether the [User](https://relativitydev.github.io/relativity.testing.framework/api/Relativity.Testing.Framework.Models.User.html) with the specified email address exists.
Gets the [User](https://relativitydev.github.io/relativity.testing.framework/api/Relativity.Testing.Framework.Models.User.html) by ArtifactID.
Gets the [User](https://relativitydev.github.io/relativity.testing.framework/api/Relativity.Testing.Framework.Models.User.html) by the specified email address.
Gets the list of Groups as NamedArtifact assigned to the specified User.
Removes the [User](https://relativitydev.github.io/relativity.testing.framework/api/Relativity.Testing.Framework.Models.User.html) from the group.
Requires the specified [User](https://relativitydev.github.io/relativity.testing.framework/api/Relativity.Testing.Framework.Models.User.html).
Returns existing [User](https://relativitydev.github.io/relativity.testing.framework/api/Relativity.Testing.Framework.Models.User.html) if the user has the properties (ArtifactID, Email) set to be able to get the user;
otherwise creates a new user.
Updates the specified [User](https://relativitydev.github.io/relativity.testing.framework/api/Relativity.Testing.Framework.Models.User.html).