"I-want-to-build-a-mobile-app-called-'BGMI-Performance-Tracker'-for-both-competitive-BGMI-players-and-coaches-to-track-match-stats,-manage-teams,-and-analyze-performance-trends.-The-app-should-allow-players-to-log-in-via-email-or-social-media-(Google,-Facebook)-and-choose-whether-they-are-a-Player-or-Coach.-Players-can-enter-match-data-such-as-Kills,-Damage,-Assists,-and-Map-played;-the-app-should-automatically-calculate-the-K/D-ratio.-Players-should-be-able-to-view-their-performance-history-with-graphs,-and-coaches-should-be-able-to-monitor-the-team's-performance,-leave-feedback,-set-team-goals,-and-compare-individual-stats.-Players-can-join-teams-using-a-Team-Code-generated-by-the-coach,-and-coaches-can-create-teams-and-manage-them.-The-app-should-support-a-freemium-model,-where-players-can-track-up-to-20-matches-per-month-for-free,-with-premium-subscriptions-for-unlimited-stats-tracking,-advanced-analytics,-and-ad-free-usage.-Implement-ad-support-for-the-free-version-using-AdMob-or-Facebook-Audience-Network.-The-app-should-be-developed-using-Flutter-or-React-Native-for-cross-platform-compatibility,-with-Firebase-or-Node.js-for-backend,-authentication,-and-real-time-data-sync.-Make-sure-to-include-privacy-features-where-stats-are-private-by-default,-and-users-can-opt-to-share-them-publicly.-Include-a-subscription-model-for-premium-access-and-set-up-user-authentication-(login,-sign-up),-team-management-logic-(team-codes,-joining/creating-teams),-and-match-stats-tracking-features,-along-with-graphs-for-performance-visualization-and-a-feedback-system-for-coaches.-Also,-integrate-Google-Play-and-Apple-App-Store-subscription-APIs,-and-ensure-users-can-manage-their-profile,-notifications,-and-privacy-settings."