doc: add default setting and README

Author: a60814billy

README.md

@@ -232,6 +232,7 @@ There are some config settings you need to change in the files below.
 | `CMD_S3_SECRET_ACCESS_KEY` | no example | AWS secret key |
 | `CMD_S3_REGION` | `ap-northeast-1` | AWS S3 region |
 | `CMD_S3_BUCKET` | no example | AWS S3 bucket name |
+| `CMD_S3_ENDPOINT` | s3.example.com | custom AWS S3 endpoint |
 | `CMD_MINIO_ACCESS_KEY` | no example | Minio access key |
 | `CMD_MINIO_SECRET_KEY` | no example | Minio secret key |
 | `CMD_MINIO_ENDPOINT` | `minio.example.org` | Address of your Minio endpoint/instance |

lib/config/default.js

@@ -66,7 +66,8 @@ module.exports = {
   s3: {
     accessKeyId: undefined,
     secretAccessKey: undefined,
-    region: undefined
+    region: undefined,
+    endpoint: undefined
   },
   minio: {
     accessKey: undefined,