Revert "修改gitignore，增加.classpath;增加排序代码及单元测试代码"

This reverts commit 94d97fbb9885d89086df7ef7af00624d19149fe4.
Revert "Revert "修改gitignore，增加.classpath;增加排序代码及单元测试代码""

This reverts commit 0903f1c4d802a21f29c2d05b84bef199d0d86385.
增加中文README