Add parameter-credential snippet.

[omniomi]

Adding a snippet for the creation of a -Credential parameter within functions.

# Specifies the user account credentials to use when performing this task.
[Parameter()]
[ValidateNotNull()]
[System.Management.Automation.PSCredential]
[System.Management.Automation.Credential()]
$Credential = [System.Management.Automation.PSCredential]::Empty

The = [System.Management.Automation.PSCredential]::Empty is tabstopped to make it easy to remove when dealing with legacy cmdlets within the function that do not handle empty PSCredential objects.

I attempted to follow the prefix style established by parameter-literalpath and parameter-path included within VS Code.

[TylerLeonhardt]

LGTM, Thank's for contributing! 🎉