Thanks to Cyanogenmod Team for Cm13 rom for Nexus 4 code name mako.We already shared the AOSP android Marshmallow 6.0 Rom also.
Now we can say that this device is legendary device.
1.Download CM13 Rom for Nexus 4 and the appropriate Gapps 6.0 package from link given below Copy it in your in your device.
2.Now place the Cyanogenmod 13 rom and gapps 6.0 zip file in sd card.
3.Now reboot to Recovery mode.
4.Then flash CM13 android marshmallow rom and gapps from recovery in it.
5.Now Clear cache and Clear Data.
6.Reboot your device.Done! you just flash cyanogenmod 13 rom in your Nexus 4 .Enjoy Android Marshmallow 6.0.
(Download latest built according to date)