changed the file structure

Code/Steiner/2dArrays/.vscode/settings.json

@@ -0,0 +1,7 @@
+{
+    "java.project.sourcePaths": ["src"],
+    "java.project.outputPath": "bin",
+    "java.project.referencedLibraries": [
+        "lib/**/*.jar"
+    ]
+}

Code/Steiner/2dArrays/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/2dArrays/src/App.java

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+public class App {
+
+    public static void main(String[] args) {
+        int[][] matrix1 = {
+                // x 0 1 2
+                { 1, 2, 3 }, // 0
+                { 4, 5, 6 }, // 1
+                { 7, 8, 9 } // 2 y
+        };
+
+        int[][] matrix2 = {
+                { 9, 8, 7 },
+                { 6, 5, 4 },
+                { 3, 2, 1 }
+        };
+
+        System.out.println(matrix1[1][2]);
+        System.out.println(matrix2[1][2]);
+
+        int[][] sumMatrix = new int[matrix1.length][matrix1.length];
+
+        for (int i = 0; i < matrix1.length; i++) {
+            for (int j = 0; j < matrix1[i].length; j++) {
+                sumMatrix[j][i] = matrix1[j][i] + matrix2[j][i];
+            }
+        }
+
+        for (int i = 0; i < matrix1.length; i++) {
+            for (int j = 0; j < matrix1[i].length; j++) {
+                System.out.print(sumMatrix[i][j] + " ");
+            }
+            System.out.println("");
+        }
+    }
+}