add generateid function

src/Utils.js

@@ -57,4 +57,15 @@ export function appointmentNotification(message, date, id, payload) {
 
 export function cancleNotification(id) {
   PushNotification.cancelLocalNotifications({ id: id });
+}
+
+export function generateID() {
+  let d = new Date().getTime();
+  let id = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
+    let r = (d + Math.random() * 16) % 16 | 0;
+    d = Math.floor(d / 16);
+    return (c == 'x' ? r : (r & 0x3 | 0x8)).toString(5);
+  });
+
+  return id;
 }
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