Added SQL PowerShell Examples

docs/azure_data_studio/README_FOR_MARKETPLACE.md

@@ -75,6 +75,73 @@ To open/view the extension's examples in Visual Studio Code, run the following f
 code (Get-ChildItem $Home\.azuredatastudio\extensions\ms-vscode.PowerShell-*\examples)[-1]
 ```
 
+### SQL PowerShell Examples
+In order to use these examples (below), you need to install the SqlServer module from the [PowerShell Gallery](https://www.powershellgallery.com/packages/SqlServer).
+
+```powershell
+Install-Module -Name SqlServer -AllowPrerelease
+```
+
+In this example, we use the `Get-SqlInstance` cmdlet to Get the Server SMO objects for ServerA & ServerB.  The default output for this command will include the Instance name, version, Service Pack, & CU Update Level of the instances.
+
+```powershell
+Get-SqlInstance -ServerInstance ServerA, ServerB
+```
+
+Here is a sample of what that output will look like:
+
+```
+Instance Name             Version    ProductLevel UpdateLevel
+-------------             -------    ------------ -----------
+ServerA                   13.0.5233  SP2          CU4
+ServerB                   14.0.3045  RTM          CU12
+```
+
+In this example, we will do a `dir` (alias for `Get-ChildItem`) to get the list of all SQL Server instances listed in your Registered Servers file, and then use the `Get-SqlDatabase` cmdlet to get a list of Databases for each of those instances.
+
+```powershell
+dir 'SQLSERVER:\SQLRegistration\Database Engine Server Group' -Recurse |
+WHERE { $_.Mode -ne 'd' } |
+FOREACH {
+    Get-SqlDatabase -ServerInstance $_.Name
+}
+```
+
+Here is a sample of what that output will look like:
+
+```
+Name                 Status           Size     Space  Recovery Compat. Owner
+                                            Available  Model     Level      
+----                 ------           ---- ---------- -------- ------- -----
+AdventureWorks2017   Normal      336.00 MB   57.01 MB Simple       140 sa   
+master               Normal        6.00 MB  368.00 KB Simple       140 sa   
+model                Normal       16.00 MB    5.53 MB Full         140 sa   
+msdb                 Normal       48.44 MB    1.70 MB Simple       140 sa   
+PBIRS                Normal      144.00 MB   55.95 MB Full         140 sa   
+PBIRSTempDB          Normal       16.00 MB    4.20 MB Simple       140 sa   
+SSISDB               Normal      325.06 MB   26.21 MB Full         140 sa   
+tempdb               Normal       72.00 MB   61.25 MB Simple       140 sa   
+WideWorldImporters   Normal         3.2 GB     2.6 GB Simple       130 sa   
+```
+
+This example uses the `Get-SqlDatabase` cmdlet to retrieve a list of all databases on the ServerB instance, then presents a grid/table (using the `Out-GridView` cmdlet) to select which databases should be backed up.  Once the user clicks on the "OK" button, only the highlighted databases will be backed up.
+
+```powershell
+Get-SqlDatabase -ServerInstance ServerB |
+Out-GridView -PassThru |
+Backup-SqlDatabase -CompressionOption On
+```
+
+This example, again, gets list of all SQL Server instances listed in your Registered Servers file, then calls the `Get-SqlAgentJobHistory` which reports every failed SQL Agent Job since Midnight, for each SQL Server instances listed.
+
+```powershell
+dir 'SQLSERVER:\SQLRegistration\Database Engine Server Group' -Recurse |
+WHERE {$_.Mode -ne 'd' } |
+FOREACH {
+    Get-SqlAgentJobHistory -ServerInstance  $_.Name -Since Midnight -OutcomesType Failed
+}
+```
+
 ## Contributing to the Code
 
 Check out the [development documentation](docs/development.md) for more details