added calculator class

Author: rafsaniShazid

src/main/java/com/thealgorithms/student/Calculator.java

@@ -0,0 +1,22 @@
+public class Calculator {
+	public int a;
+    public int b;
+
+    public Calculator(int a,int b){
+        this.a=a;
+        this.b=b;
+    }
+    public int add(){
+        return this.a+this.b;
+    }
+    public int substract(){
+        return this.a-this.b;
+    }
+    public int multiply(){
+        return this.a*this.b;
+    }
+    public int divide(){
+        return this.a/this.b;
+    }
+    
+}