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

learn/learn-kubernetes-master/kiamol/ch21/serverless/todo-mutating-handler/mutation.php

@@ -0,0 +1,14 @@
+<?php
+
+function handler($event, $context) {
+  fwrite(STDOUT, '* Mutating handler called.');
+  $conn = pg_connect('host=todo-db dbname=todo user=postgres password=kiamol-2*2*');
+  if (!$conn) {
+    echo 'Connection failed';
+    exit;
+  }
+  $sql = 'UPDATE "public"."ToDos" SET "Item"=\'Leave a nice review for KIAMOL :)\'';
+  $result = pg_query($conn, $sql); 
+  fwrite(STDOUT, '* Mutation complete.');
+  return "* Mutated...";
+}