Create README.md

Author: SuRu190

task03-multiple-heading/README.md

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+# Task 03 – Multiple Headings
+
+## ✅ Objective:
+Change the text of multiple heading elements when a button is clicked.
+
+## 💡 Concepts Practiced:
+- `querySelectorAll`
+- Looping through NodeList
+- Event listeners
+
+## 📘 What I Learned:
+- How to select and modify multiple DOM elements.
+- Iterating over elements using `forEach`.
+
+## ▶️ Example Flow:
+1. Multiple headings shown.
+2. Click button → all headings change text together.