update readme

README.md

@@ -208,6 +208,26 @@ To prevent [CORS issue with SVG](https://oreillymedia.github.io/Using_SVG/extras
 
 You can see an example of integration in the [corresponding demo folder](/demo/server/routes/index.pug).
 
+## Multiple Instance
+
+If you want to have multiple SVG sprites files, you can configure multiple instances of the plugin. To do so, you will need the options `route`. Instead of the traditionnal `/__spritemap`, you can set for example `/__flags`.
+
+```ts
+// vite.config.js / vite.config.ts
+import VitePluginSVGSpritemap from '@spiriit/vite-plugin-svg-spritemap'
+
+export default {
+  plugins: [
+    VitePluginSVGSpritemap('./src/icons/*.svg'), // will be route: '__spritemap' by default
+    VitePluginSVGSpritemap('./src/flags/*.svg', {
+      route: '__flags'
+    })
+  ]
+}
+```
+
+If you are using Sass, Less or Stylus: you can optimize the export by only generate one mixin on one instance with `styles.includeMixin` set to `false`.
+
 ## 🛠 Options
 
 The first argument is a glob path (using [fast-glob](https://github.com/mrmlnc/fast-glob)) and the second is an object with the following options :
@@ -220,6 +240,7 @@ The first argument is a glob path (using [fast-glob](https://github.com/mrmlnc/f
 | svgo           | `boolean` or `object`     | `true`  | Take an SVGO Options object.<br> If `true`, it will use the [default SVGO preset](https://github.com/svg/svgo#default-preset), if `false`, it will disable SVGO optimization |
 | injectSVGOnDev | `boolean`  | `false`   | Inject the SVG Spritemap inside the body on dev |
 | idify          | `(name:string, svg:object) => string`   | `name => options.prefix + name` | Function allowing to customize the id of each symbol of the spritemap svg. |
+| route          | `string`   | `__spritemap` | Change the route name allowing you to have multiple instance of the plugin |
 
 ### output
 
@@ -249,6 +270,7 @@ export default {
   plugins: [
     VitePluginSVGSpritemap('./src/icons/*.svg', {
       prefix: 'icon-',
+      route: '__spritemap',
       output: {
         filename: '[name].[hash][extname]',
         name: 'spritemap.svg',
@@ -281,8 +303,6 @@ export default {
 
 ## 🏃 What's next
 
-- [Support multiple instance of the plugin](https://github.com/SpiriitLabs/vite-plugin-svg-spritemap/issues/39)
-- [CSS generation callback](https://github.com/SpiriitLabs/vite-plugin-svg-spritemap/issues/16)
 - Add variable supports inspired by [svg-spritemap-webpack-plugin](https://github.com/cascornelissen/svg-spritemap-webpack-plugin/blob/master/docs/variables.md)
 
 ## 👨‍💼 Licence