chore: update README

docs/DEVELOPING.md

@@ -0,0 +1,37 @@
+# Developing
+
+## Prerequisites
+
+- Node.js >= 20: https://nodejs.org/
+
+- Rust: https://rustup.rs/
+
+- PNPM: https://pnpm.io/
+
+- Tauri: https://tauri.app/guides/prerequisites/
+
+## Build from source
+
+Clone project
+
+```
+git clone https://github.com/lumehq/lume.git && cd lume
+```
+
+Install required dependencies
+
+```
+pnpm install
+```
+
+Run dev
+
+```
+pnpm tauri dev
+```
+
+Build
+
+```
+pnpm tauri build
+```