update README

更新说明文件

Author: ufoe

README.md

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 # Data-Structures-and-Algorithms-with-Object-Oriented-Design-Patterns-in-PHP
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+This is a copy from http://www.brpreiss.com/books/opus11
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+I will make a note in Chinese later.
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+#用PHP面向对象实现基础数据结构和算法
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+拷贝自http://www.brpreiss.com/books/opus11，计划自己写一版中文注释版本，方便中文PHPER学习。