api/autotest/workspaces/{WorkspaceId}/testplan

Creates a folder path. The provided path is specified
from the root, and missing groups are created recursively.
The response from successful execution is 201 Created with the
Location header set to the URI of the node defined by the path.
Note 1: Specifying an existing path will create no new groups,
and return the specification for the existing path.
Note 2: When creating a new group in an existing group, tasks are not
inspected for duplicate names. It is possible to create a group
as a sibling to a task with the same name.