microG GmsCore is a FLOSS (Free/Libre Open Source Software) framework to allow applications designed for Google Play Services to run on systems, where Play Services is not available. If you use your phone without GAPPS this might become a useful tool for you.
microG GmsCore is one of the two core components of the microG project. His job is to replace the Gapps (you'll continue to use the PlayStore), thus giving you a longer battery life and performance without loss of resources.
This is not software developed by me, I'm just sharing the file.
Note: Only use crDroid/BeanStalk or Xposed (Use this module Fake Gapps and ignore item 3 on guide)
GUIDE – DO NOT INSTALL ANY GAPPS PACKAGE!
1. Install MicroG.zip via TWRP
2. Reboot system
3. (User of BeanStalk ignore this item) Go to Settings:
→ crDroid Settings
→ Allow signature spoofing (Enable the option) (Look!)
4. Open the microG Settings
→ System grants signature spoofing permission (Enable the option) (Look!)
5. Close the app
6. Open PlayStore and add your account
microG GmsCore, App for all devices (see above for details)
Thanks: MicroG.org (Official site the MicroG Team)