box: add docs

* reorder remotes so they are in alphabetical order by full name everywhere
  * update CONTRIBUTING doc

cmd/cmd.go

@@ -41,19 +41,20 @@ var Root = &cobra.Command{
 Rclone is a command line program to sync files and directories to and
 from various cloud storage systems and using file transfer services, such as:
 
-  * Google Drive
-  * Amazon S3
-  * Openstack Swift / Rackspace cloud files / Memset Memstore
-  * Dropbox
-  * Google Cloud Storage
   * Amazon Drive
-  * Microsoft OneDrive
-  * Hubic
+  * Amazon S3
   * Backblaze B2
-  * Yandex Disk
-  * SFTP
+  * Box
+  * Dropbox
   * FTP
+  * Google Cloud Storage
+  * Google Drive
   * HTTP
+  * Hubic
+  * Microsoft OneDrive
+  * Openstack Swift / Rackspace cloud files / Memset Memstore
+  * SFTP
+  * Yandex Disk
   * The local filesystem
 
 Features