add rclone documentation

docs/clients/rclone/_index.md

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+---
+title: Rclone
+date: 2021-11-17T00:00:00+00:00
+weight: 20
+geekdocRepo: https://github.com/owncloud/ocis
+geekdocEditPath: edit/master/docs/clients/rclone
+geekdocFilePath: _index.md
+geekdocCollapseSection: true
+---
+
+## About Rclone
+
+{{< hint ok >}}
+Rclone is a command line program to manage files on cloud storage. It is a feature rich alternative to cloud vendors' web storage interfaces. Over 40 cloud storage products support rclone including S3 object stores, business & consumer file storage services, as well as standard transfer protocols.
+
+Rclone has powerful cloud equivalents to the unix commands rsync, cp, mv, mount, ls, ncdu, tree, rm, and cat. Rclone's familiar syntax includes shell pipeline support, and --dry-run protection. It is used at the command line, in scripts or via its API.
+
+Users call rclone "The Swiss army knife of cloud storage", and "Technology indistinguishable from magic".
+{{< /hint >}}
+
+Source: [Rclone project website](https://rclone.org/)
+
+## Table of Contents
+
+{{< toc-tree >}}