check in my exisintg source code
delete src
Added whole project to git
add cc150 book
continue chapter 2
finished 2.1
finished 2.2
finished 2.4
Until chapter 4
added trees class
until 4.2
4.6
Done with CC150
Starting the leetcode
check in Palindrome
Merge pull request #1 from buaajackson/working

Working