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

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

@@ -0,0 +1,16 @@
+#! /bin/sh
+
+echo 'Registry server (blank for Docker Hub):'
+read registry
+
+if [ -n "$registry" ]; then
+    REGISTRY_SERVER=$registry
+else
+    REGISTRY_SERVER='https://index.docker.io/v1/'
+fi
+
+echo 'Username:'
+read REGISTRY_USER
+
+echo 'Password:'
+read -s REGISTRY_PASSWORD