docs: Add README for auto-icons module

packages/auto-icons/README.md

@@ -0,0 +1,42 @@
+# WXT Auto Icons
+
+## Features
+
+- Generate extension icons with the correct sizes
+- Make the icon greyscale during development
+
+## Usage
+
+Install the package:
+
+```sh
+npm i --save-dev @wxt-dev/auto-icons
+pnpm i -D @wxt-dev/auto-icons
+yarn add --dev @wxt-dev/auto-icons
+bun i -D @wxt-dev/auto-icons
+```
+
+Add the module to `wxt.config.ts`:
+
+```ts
+export default defineConfig({
+  modules: ['@wxt-dev/auto-icons'],
+});
+```
+
+And finally, save the base icon to `<srcDir>/assets/icon.png`.
+
+## Configuration
+
+The module can be configured via the `autoIcons` config:
+
+```ts
+export default defineConfig({
+  module: ['@wxt-dev/auto-icons'],
+  autoIcons: {
+    // ...
+  },
+});
+```
+
+Options have JSDocs available in your editor, or you can read them in the source code: [`AutoIconsOptions`](./src/index.ts).