Add Vue3 Cheatsheet for Developers (#7297)

more/free-programming-cheatsheets.md

@@ -185,6 +185,7 @@
 
 #### Vue.js
 
+* [Vue 3 Cheatsheet for Developers](https://learnvue.co/LearnVue-Vue-3-Cheatsheet.pdf) - LearnVue (PDF)
 * [Vue Essential Cheatsheet](https://www.vuemastery.com/pdf/Vue-Essentials-Cheat-Sheet.pdf) - Vue Mastery (PDF)
 * [Vue.js 2.3 Complete API Cheat Sheet](https://marozed.com/vue-cheatsheet) - Marcos Neves, Marozed (HTML)