Patches are always welcome! Please create pull request, reviewer than will apply as your work. You can do this by using this tutoral: https://help.github.com/articles/using-pull-requests/
To get started with Android/CyanogenMod, you'll need to get familiar with Git and Repo.
To initialize your local repository using the CyanogenMod trees, use a command like this:
repo init -u git://github.com/tekcafexos/android.git -b r1.0
Then to sync up:
repo sync
Please see the CyanogenMod Wiki for building instructions. For Vietnamese we will make tutoral in local language on soon.
Currently, we have no public buildbot yet, but all Cyanogenmod supported devices are buildable.