Adding Librepay options for donations

[rskikuli]

Liberapay is a way to donate money recurrently to people whose work you appreciate. Payments come with no strings attached. You don't know exactly who is giving to you, and donations are capped at €100.00 per week per donor to dampen undue influence.
Donations are public. By default, the total amount you give and the total amount you receive are public (you can opt out of sharing this info). Liberapay does not take a cut of payments, the service is funded by the donations to its own account. So, recipients get the full value of the donations, but there are payment processing fees when moving money in or out of Liberapay.
More info: https://liberapay.com

This could be a good alternative to gather donations from people that want to support us. What do you think?

[berkes]

F-droid supports several donation options:

• FlattrID
• LiberapayID
• Bitcoin
• Litecoin

Since the README already has a Bitcoin donation address in place, that can be added to the f-droid build-metadata already.
The other options need set-up or registriation first, before the IDs can be added to the build-metadata.

[berkes]

I've searched the repo's but cannot find where the https://gitlab.com/fdroid/fdroiddata/blob/master/metadata/com.cityzen.cityzen.txt file is generated from, or stored at. This file, or the tooling generating that file, would need a minor patch, which I gladly make, to include the BTC address. And in future add the Liberapay ID too.