To get started with the ArrowOS sources, you'll need to get familiar with:
Establishing a Build Environment
To initialize your local repository, use command:
repo init -u https://github.com/ArrowOS/android_manifest.git -b arrow-9.x
Then sync up:
repo sync -f --force-sync --no-clone-bundle -jX
Where X is the thread your CPU can handle.
For building instructions, please check :
How to Compile ArrowOS from source for your Android Device
To apply for maintainership, please check :