misc: add GreatFrontEnd banner

Author: yangshun

README.md

@@ -6,6 +6,20 @@ This repository contains a few hundred curated JavaScript interview questions wi
 2. [**All questions**](#table-of-contents-all-questions): Comprehensive and elaborate list of JavaScript interview questions that ranges from basic to advanced topics. The answers in this section are more concise. This section is useful if you rusty with JavaScript concepts and need a refresher.
 3. [**Questions by difficulty**](#questions-by-difficulty): Questions categorized by difficulty – basic, intermediate, advanced.
 
+---
+
+<div>
+<p align="center">
+  <a href="https://www.greatfrontend.com/questions/js?utm_source=github&utm_medium=referral&utm_campaign=top-js-qns&gnrs=yangshun">
+    <img src="./images/greatfrontend-js-banner4x.png" alt="GreatFrontEnd JavaScript Interview Questions" width="100%">
+  </a>
+</p>
+</div>
+
+> 💡 Nail JavaScript interviews with questions and solutions from ex-interviewers! [Try GreatFrontEnd →](https://www.greatfrontend.com/questions/js?utm_source=github&utm_medium=referral&utm_campaign=top-js-qns&gnrs=yangshun) 💡
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 ## Table of Contents (Top Questions)
 
 This list contains the top essential questions that are frequently-asked during Front End Engineer interviews. Concise versions of the answers are presented here with links to elaborate versions for further reading. This section is great if you need a quick refresher of the most important concepts.