New app: HAMtrainer

• The app complies with the inclusion criteria
• The original app author has been notified (and supports the inclusion)
• All related fdroiddata and RFP issues have been referenced in this merge request
• The upstream app source code repo contains the app metadata (summary/description/images/changelog/etc) in a Fastlane
• Releases are tagged
• Builds with fdroid build

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RFP: rfp#1433 (closed)