📝 adds mobile app readme

docs/MobileApp.md

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+# Mobile App
+
+## Introduction
+
+The mobile app is a Yew app that is compiled to WebAssembly and runs in Tauri.
+
+## Development
+
+### Prerequisites
+
+- [Rust](https://www.rust-lang.org/tools/install)
+- [Tauri](https://next--tauri.netlify.app/next/mobile/)
+
+```bash
+cargo install create-tauri-app
+cargo create-tauri-app
+cargo install [email protected]
+```
+
+### Build
+
+```bash
+cd app
+cargo tauri android init
+cargo tauri build
+cargo tauri android build
+```
+
+### Run
+
+```bash
+cargo tauri android dev
+```
+
+### Deploy
+
+```bash
+cargo tauri android build
+keytool -genkey -v -keystore release.keystore -alias app -keyalg RSA -keysize 2048 -validity 10000
+$ANDROID_HOME/build-tools/33.0.1/apksigner sign --ks release.keystore --out app.apk src-tauri/gen/android/app/build/outputs/apk/universal/release/app-universal-release-unsigned.apk
+adb install -r app.apk
+```