Add README

README.md

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+<h1 align="center">Jellyfin Expo</h1>
+<h3 align="center">Part of the <a href="https://jellyfin.media">Jellyfin Project</a></h3>
+
+<p align="center">
+Jellyfin Expo is a mobile app built with <a href="https://expo.io/">Expo</a> primarily targeting iOS devices.
+</p>
+
+## Build Process
+
+### Getting Started
+
+1. Clone or download this repository.
+   ```sh
+   git clone https://github.com/jellyfin/jellyfin-expo.git
+   cd jellyfin-expo
+   ```
+2. Install build dependencies via npm in the project directory.
+   ```sh
+   npm install
+   ```
+3. Start the build tools.
+   ```sh
+   npm start
+   ```
+4. Follow the directions in the terminal or browser window to open on a device or emulator.