Add new plugin "isocalendar"

CONTRIBUTING.md

@@ -85,8 +85,12 @@ This way you'll be able to rapidly test SVG renders with your browser.
   * To make HTTP/S requests
 * [actions/toolkit](https://github.com/actions/toolkit/tree/master) and [vercel/ncc](https://github.com/vercel/ncc)
   * To build the GitHub Action
-* [vuejs/vue](https://github.com/vuejs/vue)
+* [vuejs/vue](https://github.com/vuejs/vue) and [egoist/vue-prism-component](https://github.com/egoist/vue-prism-component) + [PrismJS/prism](https://github.com/PrismJS/prism)
   * To display server application
+* [puppeteer/puppeteer](https://github.com/puppeteer/puppeteer)
+  * To scrap the web
+* [libxmljs/libxmljs](https://github.com/libxmljs/libxmljs)
+  * To test and verify SVG validity
 
 ### 🗛 Fonts