added topic for XMPP

topics/xmpp/index.md

@@ -0,0 +1,13 @@
+---
+created_by: Jeremie Miller
+display_name: XMPP
+github_url: https://github.com/xsf
+logo: xmpp.png
+released: January 4, 1999
+short_description: XMPP is the open standard for messaging and presence.
+topic: xmpp
+url: https://xmpp.org/
+wikipedia_url: https://en.wikipedia.org/wiki/XMPP
+wikidata: Q188951
+---
+XMPP is the Extensible Messaging and Presence Protocol, a set of open technologies for instant messaging, presence, multi-party chat, voice and video calls, collaboration, lightweight middleware, content syndication, and generalized routing of XML data.