feat: added font choosing for android

lib/src/models/family.dart

@@ -0,0 +1,36 @@
+import 'font.dart';
+
+class Family {
+  String? name;
+  List<Font>? fonts;
+  String? lang;
+  String? variant;
+
+  Family({this.name, this.fonts, this.lang, this.variant});
+
+  Family.fromJson(Map<String, dynamic> json) {
+    name = json['name'];
+    if (json['font'] != null) {
+      fonts = <Font>[];
+      if(json['font'] is List) {
+        json['font'].forEach((v) {
+          fonts!.add(new Font.fromJson(v));
+        });
+      }
+
+    }
+    lang = json['lang'];
+    variant = json['variant'];
+  }
+
+  Map<String, dynamic> toJson() {
+    final Map<String, dynamic> data = new Map<String, dynamic>();
+    data['name'] = this.name;
+    if (this.fonts != null) {
+      data['font'] = this.fonts!.map((v) => v.toJson()).toList();
+    }
+    data['lang'] = this.lang;
+    data['variant'] = this.variant;
+    return data;
+  }
+}