docs: add showcase to README

README.md

@@ -33,6 +33,26 @@ https://vuepress.vuejs.org/
   - Customizable navbar and sidebar
   - [Auto-generated GitHub link and page edit links](https://vuepress.vuejs.org/default-theme-config/#git-repo-and-edit-links)
 
+## Showcase
+
+Websites built with VuePress:
+
+### Vue Ecosystem
+
+- [vue-cli](https://cli.vuejs.org/)
+- [vuex](https://vuex.vuejs.org/)
+- [vue-server-renderer](https://ssr.vuejs.org/)
+- [vue-router](https://github.com/vuejs/vue-router)
+- [vue-test-utils](https://vue-test-utils.vuejs.org/)
+- [vue-loader](https://vue-loader.vuejs.org/)
+- [vetur](https://vuejs.github.io/vetur/)
+- [rollup-plugin-vue](https://rollup-plugin-vue.vuejs.org/)
+
+### Community
+
+- [cr-vue](https://cr-vue.mio3io.com/)
+- [vuesax](https://lusaxweb.github.io/vuesax/)
+
 ## Todo Features
 
 VuePress is still a work in progress. There are a few things that it currently does not support but are planned: