createAssetType  
  Creates a custom asset type.
Prerequisites:
- The - formsInputfield is required, however, can be passed as empty (e.g.- -forms-input {}).
- You must have - CreateAssetTypepermissions.
- The domain-identifier and owning-project-identifier must be valid and active. 
- The name of the asset type must be unique within the domain — duplicate names will cause failure. 
- JSON input must be valid — incorrect formatting causes Invalid JSON errors.