docs: add c4gt 2025 project documentation

docs/projects/C4GT_Project_Documentation.md

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+# C4GT 2025 – Project Documentation
+
+## Overview
+This document summarizes my contributions during the C4GT 2025 program under the Mifos Initiative.  
+I worked on two main projects:
+- **Android Client (openmf/android-client)** – Migrating feature modules to **Compose Multiplatform (CMP)**.
+- **Mobile Wallet / Mifos Pay (openmf/mobile-wallet)** – Implementing **UPI payment flows** and setting up future modules (e.g., AutoPay, Bank Transfers, Customer/ Merchant Payments).
+
+---
+
+## 1. Android Client (openmf/android-client)
+
+### Scope
+- Migrated feature modules to **Compose Multiplatform**:
+    - `feature/checker-inbox-task`
+    - `feature/path-tracking`
+    - `feature/client` (largest module, 13 sub-features)
+- Bug fixing and improvements in sub-features (`client-identifiers`, `client-charges`, `client-pinpoint`, etc.).
+- Reviewed multiple PRs from the team.
+
+### Key Achievements
+- **Full migration** of `feature/client` to CMP (merged).
+- **Bug fixes** across sub-features: dialogs, UI states, silent failures, signature reset, charge dialog UX.
+- **Abstractions & design ideas** for Android SDK dependencies (LocationManager, File, Uri, Context).
+- **PR reviews** across the repo, helping maintain code quality.
+
+### Selected Pull Requests
+- [#2389](https://github.com/openMF/android-client/pull/2389) – Migrate checker-inbox-task to CMP
+- [#2400](https://github.com/openMF/android-client/pull/2400) – Migrate path-tracking to CMP
+- [#2401](https://github.com/openMF/android-client/pull/2401) – Migrate client module to CMP
+- [#2415](https://github.com/openMF/android-client/pull/2415) – Fix identifiers empty state & dialog layout
+- [#2430](https://github.com/openMF/android-client/pull/2430) – Merge ViewModels, add charge validation
+- [#2433](https://github.com/openMF/android-client/pull/2433) – Fix Client Pinpoint & implement Pinpoint Map dialog
+
+_(More PRs linked in weekly updates)_
+
+### Learnings
+- Large-scale CMP migrations (navigation, DI, tightly-coupled Android SDK APIs).
+- Debugging CMP-related UI bugs and state issues.
+- Collaboration via reviews, navigation design, and Jira ticketing.
+
+---
+
+## 2. Mobile Wallet / Mifos Pay (openmf/mobile-wallet)
+
+### Scope
+- **UPI Payment Flows**:
+    - Scan & Pay (via QR codes)
+    - Pay to UPI ID / Pay Anyone
+    - Bank Transfers (self & others)
+    - AutoPay module setup
+- **Standing Instructions**:
+    - Fixed loading issues and added fallbacks for missing API data.
+- **Upgrades & Setup**:
+    - Upgraded compileSdk, AGP, Gradle, and dependencies.
+    - Drafted implementation plan for **Merchant Payments KMP Module**.
+
+### Key Achievements
+- Built **frontend flows** for UPI: navigation, screen layouts, and UI/UX fixes.
+- Implemented **QR-based UPI app invocation** (draft PR).
+- Drafted backend design assumptions with **PHEE + Fineract + PSP bank UPI APIs**.
+- Fixed **Standing Instruction bugs** (merged).
+- Created Jira tickets for merchant payments and loan sandbox module.
+
+### Selected Pull Requests
+- [#1889](https://github.com/openMF/mobile-wallet/pull/1889) – Update compileSdk to 35, AGP, Gradle, dependencies
+- [#1890](https://github.com/openMF/mobile-wallet/pull/1890) – Fix SI loading issue
+- [#1891](https://github.com/openMF/mobile-wallet/pull/1891) – Add default values for missing fields
+- [#1899](https://github.com/openMF/mobile-wallet/pull/1899) – Fix DialogState serialization error
+- [#1903](https://github.com/openMF/mobile-wallet/pull/1903) – Add basic UPI payment support (draft)
+- [#1906](https://github.com/openMF/mobile-wallet/pull/1906) – Implement Pay Anyone (draft)
+- [#1907](https://github.com/openMF/mobile-wallet/pull/1907) – Add Bank Transfers (draft)
+- [#1908](https://github.com/openMF/mobile-wallet/pull/1908) – Setup AutoPay feature (draft)
+- [#1909](https://github.com/openMF/mobile-wallet/pull/1909) - implement autopay dashboard (draft)
+- [#1910](https://github.com/openMF/mobile-wallet/pull/1910) - biller and bills setup (draft)
+- [#1912](https://github.com/openMF/mobile-wallet/pull/1912) - see all; sorting; empty state; per-tab scroll; top bar
+- [#1913](https://github.com/openMF/mobile-wallet/pull/1913) - resolve overlapping screens during transitions
+
+### Learnings
+- UPI payment flow design & integration patterns.
+- Mapping frontend flows to backend orchestration.
+- Drafting extensible KMP modules (Add Payments, Merchant Payments, Loan Sandbox).
+- Handling cross-module UI/UX refinements.
+
+---
+
+## 3. Weekly Progress
+Detailed week-by-week updates are available [here](https://github.com/openMF/mobile-wallet/issues/1852#issuecomment-2950151917).  
+(Summarized in PRs above; includes Week 1 → Week 14 breakdown.)
+
+---
+
+## 4. Current Status
+- **Android Client**: CMP migration PRs merged, bug fixes completed.
+- **Mobile Wallet**: UPI payment flow and AutoPay PRs in draft/review; backend clarifications pending.
+- **Documentation**: Jira tickets created and parented under master tickets.
+
+---
+
+## 5. Next Steps
+For future contributors:
+- Complete review & merge of draft PRs in `mobile-wallet`.
+- Connect UPI frontend flows with backend APIs once integration clarifications are resolved.
+- Extend Payments and AutoPay modules as planned.
+
+---
+
+## 6. License
+This documentation is licensed under the  
+[Creative Commons Attribution 4.0 International License (CC BY 4.0)](./LICENSE.md).
+
+You are free to share and adapt the material, provided you give appropriate credit.
+
+## 7. References
+- Jira tickets: [MW-211](https://mifosforge.jira.com/browse/MW-211)
+- Midterm presentation: [Biplab_Dutta_C4GT_2025_Midpoint_Slides.pdf](https://github.com/biplab1/c4gt-2025-mifos-docs/blob/main/Biplab_Dutta_C4GT_2025_Midpoint_Slides.pdf)
+- [Mifos Initiative](https://mifos.org/)
+- [C4GT Program](https://codeforgovtech.in/)
+- [Mobile Wallet Repository](https://github.com/openMF/mobile-wallet)
+- [Android Client Repository](https://github.com/openMF/android-client)
+
+---
+