added GPS feature

lib/model/gps_data.dart

@@ -0,0 +1,37 @@
+class GpsData {
+  int id;
+  String team_name;
+  String event_code;
+  double lat;
+  double lon;
+  int created_at;
+
+  GpsData(
+      {required this.id,
+      required this.team_name,
+      required this.event_code,
+      required this.lat,
+      required this.lon,
+      required this.created_at});
+
+  factory GpsData.fromMap(Map<String, dynamic> json) {
+    return GpsData(
+        id: json["id"],
+        team_name: json["team_name"],
+        event_code: json["event_code"],
+        lat: json["lat"],
+        lon: json["lon"],
+        created_at: json["created_at"]);
+  }
+
+  Map<String, dynamic> toMap() {
+    return {
+      'id': id,
+      'team_name': team_name,
+      'event_code': event_code,
+      'lat': lat,
+      'lon': lon,
+      'created_at': created_at
+    };
+  }
+}