List Flogo activity for json2xml

[d-sauer]

Dear,
if possible I would like to contribute to the Flogo.io Showcase with the following Flogo activity:

title: Json2XML
color: green
description: Activity for converting JSON object into XML
url: https://github.com/d-sauer/contrib/tree/master/activity/json2xml

Kind regards,
Davor

[vijaynalawade]

@d-sauer Please create PR by adding above in https://github.com/TIBCOSoftware/tci-awesome/blob/master/docs/data/items.toml

[d-sauer]

Perfect, thx for the advice.

[d-sauer]

PR created #15