C++: add string

Signed-off-by: Micky Ching <mickyching@gmail.com>
ubuntu: add apt softwares

Signed-off-by: Micky Ching <mickyching@gmail.com>
Merge branch 'master' into gh-pages
index: add C++

Signed-off-by: Micky Ching <mickyching@gmail.com>
gh-pages: not exclude html files

Signed-off-by: Micky Ching <mickyching@gmail.com>
gh-pages: publish C++

Signed-off-by: Micky Ching <mickyching@gmail.com>
Merge branch 'master' into gh-pages
gh-pages: update index.html

Signed-off-by: Micky Ching <mickyching@gmail.com>