docs: add CLAUDE.md for Claude Code guidance

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+Android Client for MifosX - a Kotlin Multiplatform (KMP) application for field officers to manage financial services. Supports Android, iOS, and Desktop with offline capability.
+
+**Demo**: `gsoc.mifos.community` (mifos/password)
+
+## Build Commands
+
+```bash
+# Full pre-push check (run before PRs)
+./ci-prepush.sh
+
+# Individual tasks
+./gradlew check -p build-logic          # Verify build-logic
+./gradlew spotlessApply --no-configuration-cache  # Format code
+./gradlew dependencyGuardBaseline       # Update dependency baseline
+./gradlew detekt                        # Static analysis
+./gradlew build                         # Full build
+
+# Platform-specific
+./gradlew :cmp-android:assembleDebug    # Android debug APK
+./gradlew :cmp-desktop:run              # Run desktop app
+
+# Testing
+./gradlew testDebug                     # Unit tests
+./gradlew :lint:test :mifosng-android:lintRelease  # Lint checks
+```
+
+## Architecture
+
+### Module Structure
+```
+core/           - Shared layers (common, model, domain, data, database, network, datastore, designsystem, ui)
+feature/        - Feature modules (auth, client, loan, savings, groups, center, offline, etc.)
+cmp-android/    - Android app entry point
+cmp-desktop/    - Desktop JVM app
+cmp-ios/        - iOS app
+cmp-shared/     - Shared composition root
+cmp-navigation/ - Navigation and DI aggregation
+build-logic/    - Gradle convention plugins
+```
+
+### Clean Architecture Layers
+1. **Presentation** (feature modules): Compose screens + ViewModels with StateFlow
+2. **Domain** (core/domain): Use cases and repository interfaces
+3. **Data** (core/data): Repository implementations
+4. **Database** (core/database): Room with KMP expect/actual pattern
+5. **Network** (core/network): Ktor + Ktorfit for API calls
+
+### Key Patterns
+- **State**: Sealed classes for UI state (e.g., `ClientListUiState`)
+- **DI**: Koin modules in each module's `di/` package, aggregated in `cmp-navigation/di/KoinModules.kt`
+- **Data Flow**: `Flow<DataState<T>>` or `Flow<PagingData<T>>` from repositories
+
+### Adding a New Feature
+1. Create module under `feature/[name]/`
+2. Apply plugin: `alias(libs.plugins.mifos.cmp.feature)`
+3. Structure: Screen.kt, ViewModel.kt, UiState.kt, Route.kt + `di/Module.kt`
+4. Register DI module in `cmp-navigation/di/KoinModules.kt`
+5. Add navigation route in cmp-navigation
+
+## Key Technologies
+- Kotlin 2.1.0, Compose Multiplatform 1.9.0
+- Room 2.7.0-rc02 (multiplatform), Ktor 3.1.3, Ktorfit 2.5.2
+- Koin 4.0.1-RC1, Paging 3, Coil 3.2.0
+- Versions in `gradle/libs.versions.toml`
+
+## Commit Convention
+Format: `<type>(<scope>): <subject>`
+
+Types: `feat`, `fix`, `docs`, `refactor`, `test`, `chore`, `misc`
+
+Example: `feat(client): add client filter functionality`
+
+## Branch Policy
+- Development: `development` branch
+- PRs target: `master` branch
+- Always pull from `development` for latest changes