Create a credential assignment
*Note: The required parameters are based on the credential settings, and will vary from credential to credential.
*Note: The required parameters are based on the credential settings, and will vary from credential to credential. 
		
| Name | Type | Required | Optional | Searchable | Note | 
|---|---|---|---|---|---|
| credentialid | numeric | REQUIRED, Passed via URI | |||
| userid | numeric | REQUIRED, Passed via BODY | |||
| startdate | datetime | REQUIRED, Passed via BODY | |||
| expirationdate | datetime | REQUIRED, Passed via BODY | 
http://devsandbox.targetsolutions.com/v1/credentials/{credentialid}/assignments
		POST /credentials/{credentialid}/assignments HTTP/1.1
Host: http://devsandbox.targetsolutions.com/v1
AccessToken: kDoVZk7OQvuF0EumbF5PBg==
Cache-Control: no-cache
		{
  "userid":"random userid data",
  "startdate":"random startdate data",
  "expirationdate":"random expirationdate data"
}
			{
  "httpcode":201,
  "moreinfo":"http://developers.targetsolutions.com/v1/responsecodes/701",
  "developermessage":"The request has been fulfilled and resulted in a new resource being created. ",
  "statuscode":701,
  "status":"created"
}
			
			{
  "httpcode":401,
  "moreinfo":"http://developers.targetsolutions.com/v1/responsecodes/800",
  "developermessage":"A request was made to a resource that you do not have ownership of.",
  "statuscode":800,
  "status":"access denied"
}