Created appropriate packages for Chapter 11 and added a practice problem

Author: ARajan1084

src/com/codefortomorrow/intermediate/chapter11/practice/Methods.java

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+package com.codefortomorrow.intermediate.chapter11.practice;
+
+public class Methods {
+}

src/com/codefortomorrow/intermediate/chapter11/solutions/Methods.java

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+package com.codefortomorrow.intermediate.chapter11.solutions;
+
+public class Methods {
+}