fix: add missing sample (#337)

samples/scripts/backup-config.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+# Make sure you have a backup directory.
+mkdir ~/backup
+
+# Copy over alicloud, aws, azure, gcp, and ssh config and credentials.
+cp ~/.aliyun/config.json ~/backup/settings/aliyun/
+cp ~/.aws/config ~/backup/settings/aws/
+cp ~/.aws/credentials ~/backup/settings/aws/
+cp ~/.azure/config ~/backup/settings/azure/
+cp ~/.config/gcloud/credentials.db ~/backup/settings/gcloud/
+cp ~/.ssh/config ~/backup/settings/ssh/
+cp ~/.ssh/id_rsa ~/backup/settings/ssh/ # Is this safe?
+cp ~/.ssh/id_rsa.pub ~/backup/settings/ssh/