[ja] Translate README.md into japanese
[ja] Translate ebook/01.0.md into japanese
update readme
update readme
Update 05.2.md

Data Source Name 缩写笔误成DNS了。。。
Merge pull request #200 from huzheng/patch-1

Update 05.2.md
Update 06.2.md

修改几处笔误
Merge pull request #201 from tianyl1984/patch-1

Update 06.2.md
[ja] Translate ebook/01.1.md into japanese.
[ja] Translate 01.{2,3,4} into Japanese.
[ja] Translate the 1st section into Japanese. (complete)
[ja] Translate 02.0.md into Japanese.
[ja] Translate 02.1 into Japanese.
[ja] Translate 02.2 into Japanese.
[ja] Translate 02.3 into Japanese.
[ja] Translate 02.4 into Japanese.
[ja] Translate 02.5.md into Japanese.
[ja] Normalize `next chapter`.
Fix typo: Emplyee => Employee
[ja] Translate 02.6.md into Japanese.