Add Clear-NetboxCredential

- Grants ability to clear the stored credentials in `$Netboxconfig` variable

Functions/Setup/Clear-NetboxCredential.ps1

@@ -0,0 +1,11 @@
+function Clear-NetboxCredential {
+    [CmdletBinding(ConfirmImpact = 'Medium', SupportsShouldProcess = $true)]
+    param
+    (
+        [switch]$Force
+    )
+    
+    if ($Force -or ($PSCmdlet.ShouldProcess('Netbox Credentials', 'Clear'))) {
+        $script:NetboxConfig.Credential = $null
+    }
+}