New app: Freenet Mobile

• The app complies with the inclusion criteria
• The original app author has been notified (and supports the inclusion) (that would be me)
• All related fdroiddata and RFP issues have been referenced in this merge request
  • There are no related issues
• The upstream app source code repo contains the app metadata (summary/description/images/changelog/etc) in a Fastlane or Triple-T folder structure
  • There's no app metadata (for now)
• Builds with fdroid build
• Releases are tagged

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