To add GamerHash application to exclusions in Windows Defender, just follow these steps:
Go to Start > Settings > Update & Security > Windows Security > Virus & Threat protection
Under Virus & threat protection settings, select Manage Settings, and under Exclusions, select Add or remove exclusions
Select Add an exclusion, and then select from files, folders, file types, or process. The exclusion will apply to subfolders within a folder as well.
Select Add Folder and in the search bar type %localappdata%, and hit Enter. Find the GamerHash folder, select it, and confirm the selection by clicking Choose folder button.
After restarting your computer, Windows Defender will not consider GamerHash as a threat.