These are manifests to be used with the android build system and its repo tool.
They should be placed inside ./repo/local_manifests/
Get the manifests
curl https://raw.githubusercontent.com/TeamMoskvich/android_local_manifest/lineage-18.1/<DEVICE>.xml > .repo/local_manifests/<DEVICE>.xml
Sync the repo to get changes
repo sync -j 4 -c