Update introduction. Add translation notes.
Add notes for translators.
translate 01-introduction/sections/basics.asc

Signed-off-by: Liu Lantao <liulantao@gmail.com>
Update tanslation notes.
Update book/01-introduction/1-introduction.asc
Update:   book/01-introduction/sections/basics.asc
Merge pull request #5 from leo108/master

git tool introduce & summary
Merge pull request #6 from Lax/translate

translate 01-introduction/1-introduction.asc and 01-introduction/sections/basics.asc
Merge pull request #2 from progit/master

merge new