Created add link form

lib/models/data/check_bookmark.dart

@@ -0,0 +1,43 @@
+class CheckBookmark {
+  final dynamic bookmark;
+  final Metadata? metadata;
+
+  CheckBookmark({
+    this.bookmark,
+    this.metadata,
+  });
+
+  factory CheckBookmark.fromJson(Map<String, dynamic> json) => CheckBookmark(
+        bookmark: json["bookmark"],
+        metadata: json["metadata"] == null ? null : Metadata.fromJson(json["metadata"]),
+      );
+
+  Map<String, dynamic> toJson() => {
+        "bookmark": bookmark,
+        "metadata": metadata?.toJson(),
+      };
+}
+
+class Metadata {
+  final String? url;
+  final String? title;
+  final String? description;
+
+  Metadata({
+    this.url,
+    this.title,
+    this.description,
+  });
+
+  factory Metadata.fromJson(Map<String, dynamic> json) => Metadata(
+        url: json["url"],
+        title: json["title"],
+        description: json["description"],
+      );
+
+  Map<String, dynamic> toJson() => {
+        "url": url,
+        "title": title,
+        "description": description,
+      };
+}