Add ekklesia.gr — anonymous direct democracy for Greece

Checklist

• The app complies with the inclusion criteria
• The original app author has been notified (I am the author)
• All related fdroiddata issues have been referenced in this merge request
• Per-app repos are not used
• No fastlane metadata is included in this merge request
• Fastlane metadata is in the upstream repo
• The app has its own Source Code link
• The app has its own Issue Tracker link

Package: ekklesia.gr. License: MIT. AntiFeature NonFreeNet: HLR phone verification.