[docs] README.md added

README.md

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+# lanspread
+
+## Description
+
+Simple server and GUI for LAN parties.
+
+
+## Development
+
+### Prerequisites
+```bash
+# install Tauri CLI
+cargo install tauri-cli --version "^2.0.0"
+
+# install trunk (Build, bundle & ship your Rust WASM application to the web)
+cargo install trunk
+# alternatively if you have problems (i.e. on Windows)
+cargo install cargo-binstall
+cargo binstall trunk
+
+# install Rust WASM target
+rustup target add wasm32-unknown-unknown
+```
+
+### Build
+#### Frontend
+```bash
+# Development
+cargo tauri dev   # prefix with RUST_LOG=your_module=debug or similary for more verbose output
+
+# Production
+cargo tauri build --profile release-lto # also bundles everything into a nice platform-specific installer
+```
+
+#### Backend
+```bash
+# Development
+./server.sh   # prefix with RUST_LOG=your_module=debug or similary for more verbose output
+
+# Production
+cargo build --profile release-lto
+```