Added stubs to Matrix #547

exercises/matrix/src/main/java/Matrix.java

@@ -0,0 +1,24 @@
+import java.util.regex.Pattern;
+
+public class Matrix {
+
+    public Matrix(String matrixAsString) {
+        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
+    }
+
+    public int[] getRow(int rowNumber) {
+        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
+    }
+
+    public int[] getColumn(int columnNumber) {
+        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
+    }
+
+    public int getRowsCount() {
+        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
+    }
+
+    public int getColumnsCount() {
+        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
+    }
+}