restruct the chapter to make it more understanding
minor change to expression; unify the term and formatting
Rewrite the introduction and minor fix
Add more useful command
Modify the usage of the bashrc file
Modify the import of bash file
rename the appendix chapter's directories
Add new chapters to introduce the popular repositories
fix typo
Merge pull request #18 from patriot7/master

fix typo
minor change, add dockerpool link
Add comparison summary with vm
Add more details to help understand repo and registry
Minor changes on content
Rename the network chapter
Add dockerfile chapter