Add palindrome program

Beginner/Palindrome.java

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+import java.util.Scanner;
+
+public class Palindrome {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.print("Enter a string: ");
+        String str = sc.nextLine();
+        String reversed = new StringBuilder(str).reverse().toString();
+        if(str.equals(reversed)){
+            System.out.println(str + " is a palindrome.");
+        } else {
+            System.out.println(str + " is not a palindrome.");
+        }
+    }
+}

CONTRIBUTING.md

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+# Contributing to Java-Programs
+
+Thank you for considering contributing to this repository! Here's how you can help:
+
+## How to Contribute
+
+1. **Fork the repository**: Click on the "Fork" button at the top-right corner of this page.
+2. **Clone your fork**: `git clone https://github.com/your-username/Java-Programs.git`
+3. **Create a new branch**: `git checkout -b feature/your-feature`
+4. **Make your changes**: Implement your feature or fix.
+5. **Commit your changes**: `git commit -m 'Add feature: your-feature'`
+6. **Push to your branch**: `git push origin feature/your-feature`
+7. **Open a pull request**: Go to the "Pull Requests" tab and click "New Pull Request".
+
+## Code Style
+
+- Follow Java naming conventions.
+- Write clear and concise commit messages.
+- Ensure your code is properly indented and formatted.
+
+## Issues
+
+If you find any bugs or have suggestions, please open an issue before submitting a pull request.
+
+Happy coding!