If you want the Play Store, you need to download a "pico" or "nano" OpenGApps package for ARM / Android 7.1. Known Issues and Limitations
: Since LineageOS does not include Google Apps (GApps) by default, you'll need to download them separately.
From the status bar to the notification drawer, LineageOS allows users to tailor the interface to their liking, making the device feel modern. Prerequisites for Installation