doc: add xml service for programcall
Fixes #341
The original table needs a lot of polish and I'm not sure it's useful here anyway. These docs should be structured around how to use this package, not raw xmlservice. If anything, we should update the xmlservice docs to be clearer and point the user there from the docs here.
@kadler
Yes I think it makes sense to have this in XML Service and link to there in nodejs-itoolkit's doc.
@sravani1510
I think we should transfer this change to https://github.com/IBM/xmlservice
@kadler
Should a new page for data types be added to the xmlservice docs?
Like what was over here: https://web.archive.org/web/20220627043438/http://www.youngiprofessionals.com/wiki/index.php/XMLService/DataTypes