Connect to VirtualCenter Server and enter credentials
Connect-VIServer -Server <Server>
Save the credentials to the credential store file (By default the credential store file is stored - encrypted - under the user profile directory)
New-VICredentialStoreItem -Host <Server> -User "<Username>" -Password "<Password>"
[via]https://blogs.vmware.com/PowerCLI/2011/11/have-you-seen-powerclis-credential-store-feature.html[/via]