GET api/enterprise/task-forms/{taskId}
        The response is similar to the response from the Start Form.
To retrieve Form field values that are populated through a REST back-end:
GET api/enterprise/task-forms/{taskId}/form-values/{field}
        Which returns a list of form field values
To complete a Task form:
POST api/enterprise/task-forms/{taskId}
        with a json body that contains:
- 
values: A json object with the form field ID - form field values. The Id of the form field is retrieved from the start form call (see above).
 - 
outcome: Retrieves outcome values if defined in the Start form.
 
To save a Task form:
POST api/enterprise/task-forms/{taskid}/save-form
        Example response:
{
"values": {"formtextfield":"snicker doodle"},
"numberfield":"6",
"radiobutton":"red"
}
Where the json body contains:
- 
values : A json object with the form field ID - form field values. The Id of the form field is retrieved from the Start Form call (see above).
 
To retrieve a list of variables associated with a Task form:
GET api/enterprise/task-forms/{taskid}/variables
        Example response
[
  {
    "id": "initiator",
    "type": "string",
    "value": "3205"
  },
  {
    "id": "FormField2",
    "type": "string",
    "value": "TestVariable2"
  },
  {
    "id": "FormField1",
    "type": "string",
    "value": "TestVariable1"
  }
]