Create function and associated docs.

Get-ZANetworkVpgSummary

docs/Get-ZANetworkVpgSummary.md

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+---
+external help file: ZertoApiWrapper-help.xml
+Module Name: ZertoApiWrapper
+online version: https://github.com/ZertoPublic/ZertoApiWrapper/blob/master/docs/Get-ZANetworkVpgSummary.md
+schema: 2.0.0
+---
+
+# Get-ZANetworkVpgSummary
+
+## SYNOPSIS
+
+Get a network executive summary for a given VPG, filtered by start date and end date.
+
+## SYNTAX
+
+```
+Get-ZANetworkVpgSummary [-vpgIdentifier] <String> [[-startDate] <String>] [[-endDate] <String>]
+ [<CommonParameters>]
+```
+
+## DESCRIPTION
+
+Get a network executive summary for a given VPG, filtered by start date and end date.
+
+## EXAMPLES
+
+### Example 1
+```powershell
+PS C:\> Get-ZANetworkVpgSummary -vpgIdentifier "3456-7890-1234"
+```
+
+Get Network VPG Summary for VPG with Identifier "3456-7890-1234" for the last 7 days.
+
+## PARAMETERS
+
+### -endDate
+End date in RFC 3339 standard ('1970-01-01T00:00:00Z').
+If the end date is omitted, the default end date is the current time.
+
+```yaml
+Type: String
+Parameter Sets: (All)
+Aliases:
+
+Required: False
+Position: 3
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
+### -startDate
+Start date in RFC 3339 standard ('1970-01-01T00:00:00Z').
+If the start date is omitted, the default start date is 7 days before the end date.
+
+```yaml
+Type: String
+Parameter Sets: (All)
+Aliases:
+
+Required: False
+Position: 2
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
+### -vpgIdentifier
+The VPG identifier.
+
+```yaml
+Type: String
+Parameter Sets: (All)
+Aliases:
+
+Required: True
+Position: 1
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
+### CommonParameters
+This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable, -InformationAction, -InformationVariable, -OutVariable, -OutBuffer, -PipelineVariable, -Verbose, -WarningAction, and -WarningVariable. For more information, see [about_CommonParameters](http://go.microsoft.com/fwlink/?LinkID=113216).
+
+## INPUTS
+
+## OUTPUTS
+
+## NOTES
+
+## RELATED LINKS
+
+[Zerto Analytics REST API Endpoint for Network VPG Summary](https://docs.api.zerto.com/#/Network_Reports/get_v2_reports_vpg_network_summary)