Documentation update required for dealing with Anti Ransomware behaviour alerts

Need to update Keybase documentation on how to add ransomware exception for Bitdefender Total Security and other antivirus products that don't play well with it.

my log id: 60dbdeca4714c98a5b6e2d1c

Locate the Keybase documentation covering ransomware or antivirus behavior and review the reported Bitdefender Total Security issue, using the supplied log ID only as needed. The work is complete when the documentation explains how to add a ransomware exception for Bitdefender and other antivirus products that conflict with Keybase.

Written by the indexing model from the issue text.