Add Sunday's talk to schedule.

website/data/schedule.json

@@ -31,6 +31,12 @@
       "title": "Introducing Prav App project by Ravi Dwivedi",
       "url": "https://meet.gnome.org/sof-lml-3y5-8sw",
       "bio": "<a href=\"https://prav.app/\">Prav App</a> is a Free Software powered Instant Messaging app and service based on federated xmpp protocol and managed as a cooperative to replace WhatsApp monopoly."
+    },
+    {
+      "time": "20-December-2022 05:30 PM (IST)",
+      "title": "Contributing to Open Source Softwares- the challenges, experiences, and rewards by Sunday Cletus Nkwuda.",
+      "url": "https://meet.gnome.org/sof-lml-3y5-8sw",
+      "bio": "Sunday is a passionate Software Engineer and a Linux contributor having a good experience building Web apps with JavaScript ( Reactjs & Nodejs ) and contributing to the Debian Linux/GNU."
     }
   ]
 }