feat(iFrame): add a method for getting the participants info

modules/API/external/external_api.js

         );
     }
 
+    /**
+     * Returns the formatted display name of a participant.
+     *
+     * @param {string} participantId - The id of the participant.
+     * @returns {string} The formatted display name.
+     */
+    _getFormattedDisplayName(participantId) {
+        const { formattedDisplayName }
+            = this._participants[participantId] || {};
+
+        return formattedDisplayName;
+    }
+
     /**
      * Returns the id of the on stage participant.
      *
         return getCurrentDevices(this._transport);
     }
 
+    /**
+     * Returns the conference participants information.
+     *
+     * @returns {Array<Object>} - Returns an array containing participants
+     * information like participant id, display name, avatar URL and email.
+     */
+    getParticipantsInfo() {
+        const participantIds = Object.keys(this._participants);
+        const participantsInfo = Object.values(this._participants);
+
+        participantsInfo.forEach((participant, idx) => {
+            participant.participantId = participantIds[idx];
+        });
+
+        return participantsInfo;
+    }
+
     /**
      * Returns the current video quality setting.
      *
         return email;
     }
 
-    /**
-     * Returns the formatted display name of a participant.
-     *
-     * @param {string} participantId - The id of the participant.
-     * @returns {string} The formatted display name.
-     */
-    _getFormattedDisplayName(participantId) {
-        const { formattedDisplayName }
-            = this._participants[participantId] || {};
-
-        return formattedDisplayName;
-    }
-
     /**
      * Returns the iframe that loads Jitsi Meet.
      *