add two utils classes

Author: fishercoder1534

src/main/java/com/fishercoder/common/classes/BinaryMatrix.java

@@ -0,0 +1,9 @@
+package com.fishercoder.common.classes;
+
+import java.util.List;
+
+public interface BinaryMatrix {
+    int get(int x, int y);
+
+    List<Integer> dimensions();
+}

src/main/java/com/fishercoder/common/classes/BinaryMatrixImpl.java

@@ -0,0 +1,26 @@
+package com.fishercoder.common.classes;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class BinaryMatrixImpl implements BinaryMatrix {
+
+    private final int[][] matrix;
+
+    public BinaryMatrixImpl(int[][] matrix) {
+        this.matrix = matrix;
+    }
+
+    @Override
+    public int get(int x, int y) {
+        return matrix[x][y];
+    }
+
+    @Override
+    public List<Integer> dimensions() {
+        List<Integer> dimensions = new ArrayList<>();
+        dimensions.add(matrix.length);
+        dimensions.add(matrix[0].length);
+        return dimensions;
+    }
+}