[Copilot]

No README existed for the project — adds one covering everything needed to understand and run ActivityHive.

Contents

• Overview & features — what the app does (activity management, attendance, social following, real-time comments, auth)
• Tech stack — F# / ASP.NET Core 10 / EF Core / PostgreSQL / SignalR on the backend; React 18 / TypeScript / Vite / MobX on the frontend
• Project structure — annotated directory tree mapping each layer (API, Application, Domain, Persistence, Infrastructure, client-app, tests)
• Getting started — prerequisites, DB config, backend (dotnet run) and frontend (npm run dev) setup
• Testing — unit, integration, and full-suite commands
• API reference table — all REST endpoints + SignalR WebSocket
• Docker & Fly.io deployment — build/run commands with required environment variables

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