unbound process parameter support

TM1py/Services/ProcessService.py

@@ -194,9 +194,15 @@ def execute_process_with_return(self, process: Process, **kwargs) -> Tuple[bool,
         """
         Run unbound TI code directly
         :param process: a TI Process Object
+        :param kwargs: dictionary of process parameters and values
         :return: success (boolean), status (String), error_log_file (String)
         """
         url = "/api/v1/ExecuteProcessWithReturn?$expand=*"
+        if kwargs:
+            for parameter_name, parameter_value in kwargs.items():
+                process.add_parameter(name=parameter_name,
+                                      prompt=parameter_name,
+                                      value=parameter_value)
 
         payload = json.loads("{\"Process\":" + process.body + "}")