Update datatype_template.txt

Updated Datatype Template

datatypes/datatype_template.txt

@@ -24,6 +24,7 @@ class Datatype:
         self.cli = ""
         self.description = ""
         self.filetype = "text"
+        self.datasize = int(cli_object.data_size)
 
     # generate is a required function.  This is what is called by the framework
     # to generate the data.  Any number of "sub functions" can be created, but