feat: add makeSum function to create a closure for summing with a base value

ejercicios.js

@@ -143,3 +143,9 @@ const sumarDiez = crearSumador(10);
 console.log(sumarDiez(5));   // 15
 console.log(sumarDiez(20));  // 30
 */
+
+const makeSum = (base) => (num) => base + num;
+
+const sumTen = makeSum(10);
+console.log(sumTen(5));
+console.log(sumTen(20));