Your Apple ID, <my email>@gmail.com, was just used to download Age of Warring Empire from the App Store on a computer or device that had not previously been associated with that Apple ID.
This download was initiated from China.
That has absolutely nothing to do with Hotspot Shield or Hulu. What that indicates is that someone hacked your Apple ID and used it to purchase and download content on another device. However, I'm not aware of Apple sending e-mails that specify the country of origin of the potentially fraudulent purchase. That may indicate that this is actually a phishing attempt. Thus, don't click any links in that message.
First, you need to make sure your Apple ID is secured. Change the password on your Apple ID immediately (log in at appleid.apple.com), then enable two-factor authentication on your Apple ID to prevent such hackers from locking you out, if they get in again in the future.
Next, check to see if there is actually such a purchase in your purchase history. Look at your list of purchased apps in the App Store (how you do that depends on what version of iOS you're running), and show the apps "Not on this iPad." If there actually is an Age of Warring Empires app in your purchase history, you need to contact Apple to report that purchase as fraudulent. You may also wish to alert your credit card company for the card associated with the Apple ID.
If you don't see that app in your purchase history, that e-mail message was a phishing attempt, to try to get you to "log in" after clicking a link that would take you to a site mimicking Apple's site.