Added readme for dockerhub.

Author: jlesage

DOCKERHUB.md

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+# Docker container for Nginx Proxy Manager
+[![Docker Automated build](https://img.shields.io/docker/automated/jlesage/nginx-proxy-manager.svg)](https://hub.docker.com/r/jlesage/nginx-proxy-manager/) [![Docker Image](https://images.microbadger.com/badges/image/jlesage/nginx-proxy-manager.svg)](http://microbadger.com/#/images/jlesage/nginx-proxy-manager) [![Build Status](https://travis-ci.org/jlesage/docker-nginx-proxy-manager.svg?branch=master)](https://travis-ci.org/jlesage/docker-nginx-proxy-manager) [![GitHub Release](https://img.shields.io/github/release/jlesage/docker-nginx-proxy-manager.svg)](https://github.com/jlesage/docker-nginx-proxy-manager/releases/latest) [![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://paypal.me/JocelynLeSage/0usd)
+
+This is a Docker container for [Nginx Proxy Manager](https://nginxproxymanager.jc21.com).
+
+---
+
+[![Nginx Proxy Manager logo](https://images.weserv.nl/?url=raw.githubusercontent.com/jlesage/docker-templates/master/jlesage/images/nginx-proxy-manager-icon.png&w=200)](https://nginxproxymanager.jc21.com)[![Nginx Proxy Manager](https://dummyimage.com/400x110/ffffff/575757&text=Nginx+Proxy+Manager)](https://nginxproxymanager.jc21.com)
+
+Nginx Proxy Manager enables you to easily forward to your websites running at home or otherwise, including free SSL, without having to know too much about Nginx or Letsencrypt.
+
+---
+
+## Quick Start
+
+**NOTE**: The Docker command provided in this quick start is given as an example
+and parameters should be adjusted to your need.
+
+Launch the Nginx Proxy Manager docker container with the following command:
+```
+docker run -d \
+    --name=nginx-proxy-manager \
+    -p 8181:8181 \
+    -p 8080:8080 \
+    -p 4443:4443 \
+    -v /docker/appdata/nginx-proxy-manager:/config:rw \
+    jlesage/nginx-proxy-manager
+```
+
+Where:
+  - `/docker/appdata/nginx-proxy-manager`: This is where the application stores its configuration, log and any files needing persistency.
+
+Browse to `http://your-host-ip:8181` to access the Nginx Proxy Manager web interface.
+
+## Documentation
+
+Full documentation is available at https://github.com/jlesage/docker-nginx-proxy-manager.
+
+## Support or Contact
+
+Having troubles with the container or have questions?  Please
+[create a new issue].
+
+For other great Dockerized applications, see https://jlesage.github.io/docker-apps.
+
+[create a new issue]: https://github.com/jlesage/docker-nginx-proxy-manager/issues