Create a new parameter definition group using the name provided. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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| Visual Basic | 
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Parameters
- name
-  Type:  System String  
 The name of the group to be created.
Return Value
If successful a reference to the new parameter group is returned, otherwise a null reference ( Nothing in Visual Basic) .Remarks
 If a group with the same name already exists then an exception will be thrown.