New app: NekoX

• [?] The app complies with the inclusion criteria (https://f-droid.org/docs/Inclusion_Policy)
• [✓] The original app author has been notified (and does not oppose the inclusion)
• [✓] All related fdroiddata and RFP issues have been referenced in this merge request: rfp#1657 (closed)
• [✓] The upstream app source code repo contains the app metadata
• [✓] Builds with fdroid build: https://gitlab.com/nekohasekai/fdroiddata/-/jobs/1062719500
• [✓] Releases are tagged