add package "functional_student_practice" to start class 11 practice

Author: MartinFiorde

modules/src/main/java/com/platzi/functional_student_practice/_04_functional/MathFunctions.java

@@ -0,0 +1,4 @@
+package com.platzi.functional_student_practice._04_functional;
+
+public class MathFunctions {
+}