Create README.md

Author: SuRu190

task01-change-and-revert-heading/README.md

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+# Task 01 – Change and Revert Heading
+
+## ✅ Objective:
+Change the heading text on a button click and revert it back when clicked again.
+
+## 💡 Concepts Practiced:
+- DOM selection using `getElementById`
+- `textContent` manipulation
+- Toggling logic using conditionals
+- Button click event
+
+## 📘 What I Learned:
+- How to change text dynamically using JavaScript.
+- How to implement toggle functionality with a single button.
+
+## ▶️ Example Flow:
+1. Initial heading: “Original Text”
+2. Click button → heading becomes: “Hello World!”
+3. Click again → heading returns to: “Original Text”