added abilty to edit and delete collections

lib/model/collection.dart

@@ -7,12 +7,28 @@ class Collection {
     createdAt: json['createdAt'] as int,
   );
 
-  String name;
   int createdAt; // used as Id with millisecondsSinceEpoch
+  String name;
+
+  @override
+  bool operator ==(Object other) {
+    if (other is Collection) {
+      return hashCode == other.hashCode;
+    } else {
+      return false;
+    }
+  }
+
+  @override
+  int get hashCode => id.hashCode;
 
   int get id => createdAt;
 
   DateTime get createdDate => DateTime.fromMillisecondsSinceEpoch(createdAt);
 
   Map<String, dynamic> toJson() => {'name': name, 'createdAt': createdAt};
+
+  Collection copyWith({String? name}) {
+    return Collection(name: name ?? this.name, createdAt: createdAt);
+  }
 }