Update en.json

docs/en/en.json

@@ -1,6 +1,12 @@
 {
     "navigation": {
         "videos": [
+            {
+                "path": "https://www.youtube.com/embed/DT4D0d47udA",
+                "name": "How does Messaging and Addressing Systems work in Defold?",
+                "author": "Unfolding Defold",
+                "description": "This video explains the Messaging and Addressing system in Defold."
+            },
             {
                 "path": "https://www.youtube.com/embed/YGBSXMPd4jc",
                 "name": "Defold Building Blocks - objects and components, editor and lifecycle overview",