add Classes folder and project solution

Author: galinap684

7-classes/Calculator.kt

@@ -0,0 +1,43 @@
+class Calculator(val name: String) {
+
+  init {
+    println("$name's Calculator 🧮")
+  }
+  
+  fun add(a: Int, b: Int): Int {
+    return a + b
+  }
+  
+  fun subtract(a: Int, b: Int): Int {
+    return a - b
+  }
+  
+  fun multiply(a: Int, b: Int): Int {
+    return a * b
+  }
+  
+  fun divide(a: Int, b: Int): Any {
+    if (b == 0) {
+      return "Error! Dividing by zero is not allowed." 
+    } else {
+      return a / b
+    } 
+  }
+  
+  fun power(a: Int, b: Int): Int {
+    var result = 1
+
+    for (i in 1..b) {
+      result *= a
+    } 
+    return result
+  } 
+}
+  
+fun main() {
+  var myCalculator = Calculator("Codey")
+  println(myCalculator.add(5, 7))
+  println(myCalculator.subtract(45, 11))
+  println(myCalculator.divide(8, 0))
+  println(myCalculator.power(2, 1))
+}