added NFC fix for LG G5

_includes/templates/before_install_h850.md

+## Important note
+
+On some LG G5 devices you may face an issue with the NFC not working.  A solution as shared in a post on [XDA](https://forum.xda-developers.com/lg-g5/help/nfc-setting-grayed-t3889457_) required to flash this [driver](https://androidfilehost.com/?fid=962339331458997637)
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