Update README

README

@@ -1,6 +1,26 @@
-The codes I wrote while reading "C++ Primer 5th" .
+#C++ Primer (5th Edition) exercise answers.
 
-Use -std=c++11 flag when compiling.
+![book](http://img3.douban.com/lpic/s26020180.jpg)
 
+### Something I hope you know before go into the answers.
 
+- Use -std=c++11 flag when compiling.
+- I don't know the standard answer, but I tried my best to keep the correctness, if you found any bug, please [tell me](https://github.com/Mooophy/Cpp-Primer/issues/new), thanks.
+- I have downloaded the headers from this book's [web site](http://www.informit.com/store/c-plus-plus-primer-9780321714114) and put them in the `include` folder.
+- In order to test the program in an efficient way, I also put the test data file in the `data` folder.
 
+### If you want to contribute this repository.
+
+- Please **fork** this repository.
+- **commit** in your own repository.
+- Create a **pull request** for me.
+
+### Getting Start
+
+[Begin to read](http://pezy.viewdocs.io/Cpp-Primer)
+
+Thanks for [viewdocs](https://github.com/progrium/viewdocs).
+
+### Read more?
+
+[PO在StackOverflow上的习题](http://book.douban.com/review/6500246/)