doc(README): add examples

Author: marjune163

README.md

@@ -35,9 +35,11 @@ Start server on port 8080, root directory is /usr/share/doc:
 ghfs -l 8080 -r /usr/share/doc
 ```
 
-Start server on default port, root directory is /tmp, and allow upload files to file system directory /tmp/data:
+Start server on default port, root directory is /var/tmp, and allow upload files into ./data:
 ```sh
-ghfs -r /tmp -u /data
+ghfs -r /var/tmp -u /data
+# or
+ghfs -r /var/tmp --upload-dir /var/tmp/data
 ```
 
 Share files from /etc, but also mount /usr/share/doc to url path /doc
@@ -69,6 +71,11 @@ Http Basic Auth:
 ghfs --auth /files --user user1:pass1 --user-sha1 user2:8be52126a6fde450a7162a3651d589bb51e9579d
 ```
 
+Share /data, grant upload permission on /data/upload to user "admin" and "root", others are read only:
+```sh
+ghfs -r /data --user admin:adminpass root:rootpass user1:user1pass user2:user2pass --upload-user :/upload:admin:root
+```
+
 Start 2 virtual hosts:
 - server 1
     - listen on port 80 for http

README.zh-CN.md

@@ -35,9 +35,11 @@ ghfs -l 8080
 ghfs -l 8080 -r /usr/share/doc
 ```
 
-在默认端口启动服务器，根目录为/tmp，并允许上传文件到/tmp/data：
+在默认端口启动服务器，根目录为/var/tmp，并允许上传文件到./data：
 ```sh
-ghfs -r /tmp -u /data
+ghfs -r /var/tmp -u /data
+# 或
+ghfs -r /var/tmp --upload-dir /var/tmp/data
 ```
 
 共享/etc下的文件，同时把/usr/share/doc挂载到URL路径/doc下：
@@ -68,6 +70,11 @@ http基本验证：
 ghfs --auth /files --user user1:pass1 --user-sha1 user2:8be52126a6fde450a7162a3651d589bb51e9579d
 ```
 
+共享/data，授予用户“admin”和“root”在/data/upload的上传权限，其他用户只读：
+```sh
+ghfs -r /data --user admin:adminpass root:rootpass user1:user1pass user2:user2pass --upload-user :/upload:admin:root
+```
+
 启动2台虚拟主机：
 - 服务器1
     - 在80端口提供http服务