新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件

learn/learn-kubernetes-master/kiamol/ch20/base64.ps1

@@ -0,0 +1,15 @@
+function Convert-ToBase64 {
+	param (
+		[parameter(ValueFromPipeline)]
+		[string] $text,
+		[switch] $d
+	)
+	if ($d){
+		[Text.Encoding]::UTF8.GetString([Convert]::FromBase64String($text))
+	}
+	else {
+		[Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes($text))
+	}
+}
+
+Set-Alias base64  Convert-ToBase64