Update docs (#200)

This is a documentation-only update so automerging.  Please review the commit if there are any follow-ups requested.

* Update .gitignore for docfx genertated files

* Update documenation (part 1)

* Update docs and add some samples

* More doc updates

docs/samples/smo/PowerShellScript/createxmlshema.ps1

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+<#
+This code example shows how to create an XML schema by using the XmlSchemaCollection object.
+#>
+
+#DLL location needs to be specified
+$pathtodll = "" 
+Add-Type -Path "$pathtodll\Microsoft.SqlServer.Smo.dll"
+Add-Type -Path "$pathtodll\Microsoft.SqlServer.ConnectionInfo.dll"
+
+#Connection context need to be specified
+$srv = New-Object Microsoft.SqlServer.Management.Smo.Server()
+$srv.ConnectionContext.LoginSecure = $false
+$srv.ConnectionContext.ServerInstance = "instance_name"
+$srv.ConnectionContext.Login = "user_id"
+$srv.ConnectionContext.Password = "pwd"
+
+#Reference the master database   
+$db = $srv.Databases["master"]
+
+#Create a new schema collection  
+$xsc = New-Object -TypeName Microsoft.SqlServer.Management.SMO.XmlSchemaCollection -argumentlist $db,"SampleCollection"  
+  
+#Add the xml  
+$dq = '"' # the double quote character  
+$xsc.Text = "<schema xmlns=" + $dq + "http://www.w3.org/2001/XMLSchema" + $dq + "  xmlns:ns=" + $dq + "http://ns" + $dq + "><element name=" + $dq + "e" + $dq + " type=" + $dq + "dateTime" + $dq + "/></schema>"  
+  
+#Create the XML schema collection on the instance of SQL Server.  
+$xsc.Create

docs/samples/smo/PowerShellScript/dbiteration.ps1

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+<#
+This script demonstrates iterations through the rows and display collation details for a remote or local instance of SQL Server.
+#>
+
+#DLL location needs to be specified
+$pathtodll = "" 
+
+Add-Type -Path "$pathtodll\Microsoft.SqlServer.Smo.dll"
+Add-Type -Path "$pathtodll\Microsoft.SqlServer.ConnectionInfo.dll"
+
+#Connection context need to be specified
+$srv = New-Object Microsoft.SqlServer.Management.Smo.Server()
+$srv.ConnectionContext.LoginSecure = $false
+$srv.ConnectionContext.ServerInstance = "instance_name"
+$srv.ConnectionContext.Login = "user_id"
+$srv.ConnectionContext.Password = "pwd"
+
+$datatable = $srv.EnumCollations()
+
+Foreach ($row in $datatable.Rows)
+{
+   Write-Host "============================================"
+   Foreach ($column in $row.Table.Columns)
+   {
+      Write-Host $column.ColumnName "=" $row[$column].ToString()
+   }
+}

docs/samples/smo/PowerShellScript/managetable.ps1

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+<#
+This code example creates a table that has several columns with different types and purposes. The code also provides examples of how to create an identity field, how to create a primary key, and how to alter table properties.
+#>
+
+#DLL location needs to be specified
+$pathtodll = "" 
+Add-Type -Path "$pathtodll\Microsoft.SqlServer.Smo.dll"
+Add-Type -Path "$pathtodll\Microsoft.SqlServer.ConnectionInfo.dll"
+
+#Connection context need to be specified
+$srv = New-Object Microsoft.SqlServer.Management.Smo.Server()
+$srv.ConnectionContext.LoginSecure = $false
+$srv.ConnectionContext.ServerInstance = "instance_name"
+$srv.ConnectionContext.Login = "user_id"
+$srv.ConnectionContext.Password = "pwd"
+
+#And the database object corresponding to master.    
+$db = $srv.Databases["master"]  
+
+#Create a SMO Table  
+$tb = New-Object -TypeName Microsoft.SqlServer.Management.SMO.Table -argumentlist $db, "Test_Table"  
+  
+#Add various columns to the table.   
+$Type = [Microsoft.SqlServer.Management.SMO.DataType]::NChar(50)  
+$col1 =  New-Object -TypeName Microsoft.SqlServer.Management.SMO.Column -argumentlist $tb,"Name", $Type  
+$col1.Collation = "Latin1_General_CI_AS"  
+$col1.Nullable = $true  
+$tb.Columns.Add($col1)  
+  
+$Type = [Microsoft.SqlServer.Management.SMO.DataType]::Int  
+$col2 =  New-Object -TypeName Microsoft.SqlServer.Management.SMO.Column -argumentlist $tb,"ID", $Type  
+$col2.Identity = $true  
+$col2.IdentitySeed = 1  
+$col2.IdentityIncrement = 1  
+$tb.Columns.Add($col2)   
+  
+$Type = [Microsoft.SqlServer.Management.SMO.DataType]::Real  
+$col3 =  New-Object -TypeName Microsoft.SqlServer.Management.SMO.Column -argumentlist $tb,"Value", $Type  
+$tb.Columns.Add($col3)   
+  
+$Type = [Microsoft.SqlServer.Management.SMO.DataType]::DateTime  
+$col4 =  New-Object -TypeName Microsoft.SqlServer.Management.SMO.Column -argumentlist $tb,"Date", $Type  
+$col4.Nullable = $false  
+$tb.Columns.Add($col4)   
+  
+#Create the table  
+$tb.Create()  
+  
+$Type = [Microsoft.SqlServer.Management.SMO.DataType]::DateTime  
+$col5 =  New-Object -TypeName Microsoft.SqlServer.Management.SMO.Column -argumentlist $tb,"ExpiryDate", $Type  
+$col5.Nullable = $false  
+$tb.Columns.Add($col5)   
+  
+#Run the Alter method to make the change on the instance of SQL Server.   
+$tb.Alter()  
+  
+#Remove the table from the database.   
+$tb.Drop()