add structure

lib/vo/report_user.dart

@@ -0,0 +1,33 @@
+class ReportUser {
+  String id;
+  String reportID;
+  String reportName;
+  String userID;
+  String userName;
+  ReportUser({
+    this.id,
+    this.reportID,
+    this.reportName,
+    this.userID,
+    this.userName,
+  });
+  factory ReportUser.fromMap(Map<String, dynamic> map, String docID) {
+    return ReportUser(
+      id: docID,
+      reportID: map['report_id'],
+      reportName: map['report_name'],
+      userID: map['user_id'],
+      userName: map['user_name'],
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    return {
+      "id": id,
+      "report_id": reportID,
+      "report_name": reportName,
+      "user_id": userID,
+      "user_name": userName
+    };
+  }
+}