To get started with Android/LineageOS, you'll need to get familiar with Git and Repo.
To initialize your local repository using the LineageOS trees, use a command like this:
repo init -u git://github.com/LineageOS-13-MT6572/android.git -b cm-13.0
Then to sync up:
repo sync
Please see the LineageOS Wiki for building instructions.
For more information on this Github Organization and how it is structured, please read the wiki article
Then to sync up:
source build/envsetup.sh
brunch cm_yaris_m_gsm-userdebug
# fire855
# ferhung-mtk
# Tirth Patel
# all those who initially brought up Android M to MTK