added Cell class

src/backend/Cell.java

@@ -0,0 +1,11 @@
+package backend;
+
+public class Cell {
+	int x,y,val;
+	public Cell(int x, int y, int val) {
+		this.x = x;
+		this.y = y;
+		this.val = val;
+		
+	}
+}