Add comprehensive project documentation for interview preparation

[Copilot]

Replaced minimal 3-line README with comprehensive technical documentation covering the KodeShell competitive programming platform.

Changes

• Feature Documentation: Documented 30+ features across 6 categories (Contest Management, Multi-Platform Integration, Social/Community, Authentication, Notifications, Submission Tracking)

• Technical Architecture: Added architecture patterns (MVC, Fragment-based navigation), backend services (Firebase Auth/Realtime DB/Storage), and networking layer details

• API Integrations: Documented Codeforces (Volley), LeetCode (OkHttp/GraphQL), and AtCoder (Kontests.net) implementations

• Installation Guide: Added Firebase configuration, database schema, OAuth setup, and build instructions

• Project Structure: Included complete directory tree with 9 activities, 16 fragments, and component organization

• Dependencies: Catalogued 50+ libraries with versions (Firebase, Material Design, networking, UI components)

• Future Work: Listed technical improvements (Kotlin migration, MVVM, Jetpack Compose, Hilt DI) and feature enhancements

Context

Project built 2 years ago, now on CV. Documentation enables quick feature recall and technical discussions during interviews.

Original prompt

analyze the full project then make a readme file where add all the feature that present in this project , because i add this project in my cv and in interview may they can ask about this project. i bulit it 2 years ago so i forgot most of the things

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[Istahak]

update readme File using github copilot