fix(itoabase): adding missing main file for the code editor

subjects/itoabase/main.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"fmt"
+	"piscine"
+)
+
+func main() {
+	fmt.Println(piscine.ItoaBase(10, 2))
+	fmt.Println(piscine.ItoaBase(255, 16))
+	fmt.Println(piscine.ItoaBase(-42, 4))
+	fmt.Println(piscine.ItoaBase(123, 10))
+	fmt.Println(piscine.ItoaBase(0, 8))
+	fmt.Println(piscine.ItoaBase(255, 2))
+	fmt.Println(piscine.ItoaBase(-255, 16))
+	fmt.Println(piscine.ItoaBase(15, 16))
+	fmt.Println(piscine.ItoaBase(10, 4))
+	fmt.Println(piscine.ItoaBase(255, 10))
+}