Update README.md

Author: mkr-infinity

README.md

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-hello
+# 🧮 Matrix Solver
+
+Fast, fully offline Android matrix calculator with step-by-step solutions and clean Material UI.
+
+---
+
+## ✨ Features
+
+* Matrix addition, subtraction, multiplication
+* Determinant & inverse
+* Transpose
+* Step-by-step solution
+* Local history (saved on device)
+* Export result as image
+* Multiple themes
+* No internet required 🔒
+
+---
+
+## 📱 Screenshots
+
+### 🏠 Matrix Input
+
+![Matrix Input](./assets/screenshots/matrix-input.jpg)
+
+### 📊 Result Screen
+
+![Result](./assets/screenshots/result.jpg)
+
+### 📐 Step-by-Step Solution
+
+![Steps](./assets/screenshots/steps.jpg)
+
+### 🕘 History
+
+![History](./assets/screenshots/history.jpg)
+
+### 🎨 Themes / Settings
+
+![Themes](./assets/screenshots/themes.jpg)
+
+### 👤 About
+
+![About](./assets/screenshots/about.jpg)
+
+---
+
+## 📦 Download
+
+From **Releases** install:
+
+* **arm64-v8a** → Recommended for modern phones ✅
+* **armeabi-v7a** → Old / low-end devices
+* **x86 / x86_64** → Emulator
+* **universal** → Works on all devices
+
+---
+
+## 🚀 Install
+
+Download → Open APK → Allow unknown apps → Install.
+
+---
+
+## 🛠 Tech Stack
+
+* Expo + React Native
+* Native Android (Gradle release build)
+* Material Design
+
+---
+
+## 👨‍💻 Developer
+
+**Mohammad Kaif Raja 🇮🇳**
+
+GitHub → https://github.com/mkr-infinity
+Instagram → https://instagram.com/mkr_infinity
+Telegram → https://t.me/mkr_infinity
+
+---
+
+⭐ Star this repo if you like the project.