issue #3435. Add chapter9's en.md
issue #3435. Add the outline of this tutorial.
issue #3435. Finish the first section
issue #3435. add another two sections
issue #3435. Finish the chapter 9
fixed #3435. Finish the catalog and chapter 9
Merge pull request #23 from andyque/feature3435

Feature#3435
Add en & zh catalog for the next schedule of jobs. Rename folder "new_gui" to "guy"
add 2 docs that is already available.
Merge pull request #24 from walzer/master

add items into catalog (both en & zh) for further jobs.
fix a typo in catalog/en.md
apply vector<T>, map<K,V> for markdown format in catalog/en.md
issue #3451. add one article
Merge pull request #25 from andyque/feature#3451

issue #3451. add one article
Merge remote-tracking branch 'upstream/master'