chore: Added Development.md (#328)

DEVELOPEMENT.md

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+# 🚀 Fladder Dev Setup
+
+## 🔧 Requirements
+
+Ensure the following tools are installed:
+
+- [Flutter SDK](https://flutter.dev/docs/get-started/install) (latest stable)
+- [Android Studio](https://developer.android.com/studio) (for Android development and emulators)
+- [VS Code](https://code.visualstudio.com/) with:
+  - Flutter extension
+  - Dart extension
+
+Verify your Flutter setup with:
+
+```bash
+flutter doctor
+```
+
+## 🚀 Quick Start
+
+```bash
+# Clone the repository
+git clone https://github.com/DonutWare/Fladder.git
+cd Fladder
+
+# Install dependencies
+flutter pub get
+```
+
+## 🐧 Linux Dependencies
+
+If you're on **Linux**, install the `mpv` dependency:
+
+```bash
+sudo apt install libmpv-dev
+```
+
+## 🛠️ Running the App
+
+1. **Connect a device** or launch an emulator.
+2. In VS Code:
+   - Select the target device (bottom right corner).
+   - Press `F5` or go to **Run > Start Debugging**.
+   - If prompted, select **"Run Anyway"**.
+
+## ⚙️ Code Generation
+
+Generate build files (e.g., for `json_serializable`, `freezed`, etc.):
+
+```bash
+flutter pub run build_runner build
+```
+
+> Tip: Use `watch` for continuous builds during development:
+```bash
+flutter pub run build_runner watch
+```
+
+## 🌐 Using a demo Server
+You can use a fake server from Jellyfin.
+https://demo.jellyfin.org/stable/web/