Week-2 challenge readme updated

challenges/week-2.md

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+# Week 2 challenge - Simple Counter App
+
+## Objective
+
+Create a counter app there you will show three button : Increase, Decrease, Reset and Show The count over the buttons.
+
+## Requirements
+
+- Create a `Counter` Component.
+- Declare a state name of count and setCount.
+- Make three buttons : Increase, Decrease, Reset and give them event handler by function like: function handleIncrement and handleDecrement and handleReset.
+- If someone click on increase button the count will be increase and If someone click on decrease button the count will be decrease before going to 0 and If someone click on reset button the count will be 0 before going to 0.
+- Display: `0` initially;
+
+## Submission
+
+- Branch: `week-2-solution`
+- Submit PR to this repository
+- Include your GitHub username in the PR title
+
+## Points
+
+- Challenge completed: 15 points
+- PR merged: 10 points
+
+---
+
+### Solution by @mahmudul-Hasan-2
+
+```javascript
+import React from "react";
+
+function Greeting() {
+  const [count, setCount] = useState(0);
+  function handleIncrement () {
+    setCount(count + 1);
+  }
+  function handleDecrement () {
+    count > 0 && setCount(count - 1);
+  }
+  function handleReset () {
+    count > 0 setCount(0);
+  }
+  return (
+    <div>
+        <h2>{count}</h2>
+        <button onClick={handleIncrement}>Increment</button>
+        <button onClick={handleDecrement}>Decrement</button>
+        <button onClick={handleReset}>Reset</button>
+    </div>
+  )
+}
+
+export default Greeting;
+```