Added Message Model

Author: mrsumanbiswas

mobile/lib/models/message.dart

@@ -0,0 +1,43 @@
+class Message {
+  final String id;
+  final String senderId;
+  final String receiverId;
+  final String content;
+  final DateTime createdAt;
+
+  Message({
+    required this.id,
+    required this.senderId,
+    required this.receiverId,
+    required this.content,
+    required this.createdAt,
+  });
+
+  factory Message.fromJson(Map<String, dynamic> json) {
+    return Message(
+      id: json['id'],
+      senderId: json['sender_id'],
+      receiverId: json['receiver_id'],
+      content: json['content'],
+      createdAt: DateTime.parse(json['created_at']),
+    );
+  }
+
+  factory Message.fromMap(Map<String, dynamic> map) {
+    return Message(
+      id: map['id'],
+      senderId: map['sender_id'],
+      receiverId: map['receiver_id'],
+      content: map['content'],
+      createdAt: DateTime.parse(map['created_at']),
+    );
+  }
+
+  Map<String, dynamic> toMap() => {
+    'id': id,
+    'sender_id': senderId,
+    'receiver_id': receiverId,
+    'content': content,
+    'created_at': createdAt.toIso8601String(),
+  };
+}