creating messanger for content scripst

to pass messages to overlay

src/chat_overlay.js

@@ -0,0 +1,12 @@
+const message_container =  document.getElementById("message_container");
+
+
+chrome.runtime.onMessage.addListener(
+    function(request, sender, sendResponse) {
+
+      if (request.message == "messageNode"){
+        message_container.innerHTML += request.node;
+        message_container.scrollBy(message_container.scrollHeight);
+        return;
+      }
+});