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

learn/learn-kubernetes-master/kiamol/ch11/set-registry-variables.ps1

@@ -0,0 +1,12 @@
+$registry = Read-Host -Prompt 'Registry server (blank for Docker Hub)'
+if ($registry.Length -eq 0) {
+    $REGISTRY_SERVER='https://index.docker.io/v1/'
+}
+else {
+    $REGISTRY_SERVER=$registry
+}
+
+$REGISTRY_USER = Read-Host -Prompt 'Username'
+
+$password = Read-Host -Prompt 'Password'-AsSecureString
+$REGISTRY_PASSWORD = [System.Net.NetworkCredential]::new("", $password).Password