Add "verification" to Flathub

[claudioandre-br]

1. Is your feature request related to a problem? Please describe.

Verify your app ID to indicate that your Flathub upload is approved by the app developer. You'll need to prove that you have control of the app via a website on the app's domain or by checking access to the app's account on a source code hosting site. The verified badge will be shown alongside the app name, publisher name, and the way that the app ID was verified.

2. Describe the solution you'd like

Create a page at https://openwall.com/.well-known/org.flathub.VerifiedApps.txt containing the following token:

67ab019e-c4e8-456f-80ca-ad89b7d4121d

---

If it is necessary to become a publisher of the application on Flathub (or on snap/Launchpad), the person must go to johh's repository on Flathub (or to Lauchpad, where the build takes place, and to the snapcraft store) and request this.

We never know when shit happens