changed the file structure

Code/Steiner/reverseNumber/.vscode/settings.json

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+{
+    "java.project.sourcePaths": ["src"],
+    "java.project.outputPath": "bin",
+    "java.project.referencedLibraries": [
+        "lib/**/*.jar"
+    ]
+}

Code/Steiner/reverseNumber/README.md

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+## Getting Started
+
+Welcome to the VS Code Java world. Here is a guideline to help you get started to write Java code in Visual Studio Code.
+
+## Folder Structure
+
+The workspace contains two folders by default, where:
+
+- `src`: the folder to maintain sources
+- `lib`: the folder to maintain dependencies
+
+Meanwhile, the compiled output files will be generated in the `bin` folder by default.
+
+> If you want to customize the folder structure, open `.vscode/settings.json` and update the related settings there.
+
+## Dependency Management
+
+The `JAVA PROJECTS` view allows you to manage your dependencies. More details can be found [here](https://github.com/microsoft/vscode-java-dependency#manage-dependencies).

Code/Steiner/reverseNumber/src/App.java

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+public class App {
+    public static int reverse(int number) {
+        int reversed = 0;
+        while (number != 0) {
+            int remainder = number % 10;
+            reversed = reversed * 10 + remainder;
+            number = number / 10;
+        }
+        return reversed;
+    }
+
+    public static void main(String[] args) {
+        int number = 12345;
+        int reversed = reverse(number);
+        System.out.println("The number is: " + number);
+        System.out.println("The reversed number is: " + reversed);
+    }
+}