Update AddAppointmentInvite comment document

Update AddAppointmentInvite comment document
Update AddAppointmentInvite comment

Update AddAppointmentInvite comment
Add AddComment Request API

Add AddComment Request API
Add AddedComment Struct

Add AddedComment Struct
Remove unused SimpleXml class

Remove unused SimpleXml class
Add AddComment Test

Add AddComment Test
Add AddedComment struct test

Add AddedComment struct test