Multi tenancy doc (#4215)

* Add multi-tenancy doc

* Multi-tenancy documents

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* Update deploy-multiple-minio.md

* Update deploy-multiple-minio.md

* Update deploy-multiple-minio.md

* Update deploy-multiple-minio.md

* Update multi-tenant details

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* Rename deploy-multiple-minio.md to README.md

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docs/multi-tenancy/README.md

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+# Multi-tenant Minio Deployment Guide [![Slack](https://slack.minio.io/slack?type=svg)](https://slack.minio.io) [![Go Report Card](https://goreportcard.com/badge/minio/minio)](https://goreportcard.com/report/minio/minio) [![Docker Pulls](https://img.shields.io/docker/pulls/minio/minio.svg?maxAge=604800)](https://hub.docker.com/r/minio/minio/) [![codecov](https://codecov.io/gh/minio/minio/branch/master/graph/badge.svg)](https://codecov.io/gh/minio/minio)
+
+## Standalone Deployment
+To host multiple tenants on a single machine, run one Minio server per tenant with dedicated HTTPS port, config and data directory.  
+
+#### Example 1 : Single host, single drive
+
+This example hosts 3 tenants on a single drive.
+```sh
+minio --config-dir ~/tenant1 server --address :9001 /disk1/data/tenant1
+minio --config-dir ~/tenant2 server --address :9002 /disk1/data/tenant2
+minio --config-dir ~/tenant3 server --address :9003 /disk1/data/tenant3
+```
+
+![Example-1](https://raw.githubusercontent.com/minio/minio/master/docs/screenshots/Example-1.png)
+
+#### Example 2 : Single host, multiple drives (erasure code)
+
+This example hosts 3 tenants on multiple drives.
+```sh
+minio --config-dir ~/tenant1 server --address :9001 /disk1/data/tenant1 /disk2/data/tenant1 /disk3/data/tenant1 /disk4/data/tenant1
+minio --config-dir ~/tenant2 server --address :9002 /disk1/data/tenant2 /disk2/data/tenant2 /disk3/data/tenant2 /disk4/data/tenant2
+minio --config-dir ~/tenant3 server --address :9003 /disk1/data/tenant3 /disk2/data/tenant3 /disk3/data/tenant3 /disk4/data/tenant3
+```
+![Example-2](https://raw.githubusercontent.com/minio/minio/master/docs/screenshots/Example-2.png)
+
+## Distributed Deployment
+To host multiple tenants in a distributed environment, run several distributed Minio instances concurrently.  
+
+#### Example 1 : Multiple host, multiple drives (erasure code)
+
+This example hosts 3 tenants on a 4 node distributed setup. Execute the following command on all the four nodes. 
+
+```sh
+export MINIO_ACCESS_KEY=<TENANT1_ACCESS_KEY>
+export MINIO_SECRET_KEY=<TENANT1_SECRET_KEY>
+minio --config-dir ~/tenant1 server --address :9001 http://192.168.10.11/disk1/data/tenant1 http://192.168.10.12/disk1/data/tenant1 http://192.168.10.13/disk1/data/tenant1 http://192.168.10.14/disk1/data/tenant1
+
+export MINIO_ACCESS_KEY=<TENANT2_ACCESS_KEY>
+export MINIO_SECRET_KEY=<TENANT2_SECRET_KEY>
+minio --config-dir ~/tenant2 server --address :9002 http://192.168.10.11/disk1/data/tenant2 http://192.168.10.12/disk1/data/tenant2 http://192.168.10.13/disk1/data/tenant2 http://192.168.10.14/disk1/data/tenant2
+
+export MINIO_ACCESS_KEY=<TENANT3_ACCESS_KEY>
+export MINIO_SECRET_KEY=<TENANT3_SECRET_KEY>
+minio --config-dir ~/tenant3 server --address :9003 http://192.168.10.11/disk1/data/tenant3 http://192.168.10.12/disk1/data/tenant3 http://192.168.10.13/disk1/data/tenant3 http://192.168.10.14/disk1/data/tenant3
+```
+
+![Example-3](https://raw.githubusercontent.com/minio/minio/master/docs/screenshots/Example-3.png)
+
+## Cloud Scale Deployment
+For large scale multi-tenant Minio deployments, we recommend using one of the popular container orchestration platforms, e.g. Kubernetes, DC/OS or Docker Swarm. Refer [this document](https://docs.minio.io/docs/minio-deployment-quickstart-guide) to get started with Minio on orchestration platforms.  
+
+