add CONTRIBUTORS.md

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* [@callbay](https://github.com/callbay)
* [@lsxredrain](https://github.com/lsxredrain)
* [@hejin1026](https://github.com/hejin1026)
* [@desoulter](https://github.com/desoulter)
* [@turtleDeng](https://github.com/turtleDeng)
* [@Hades32](https://github.com/Hades32)
* [@huangdan](https://github.com/huangdan)
* [@phanimahesh](https://github.com/phanimahesh)
* [@dvliman](https://github.com/dvliman)
* [@vowstar](https://github.com/vowstar)
* [@TheWaWaR](https://github.com/TheWaWaR)
* [@hejin1026](https://github.com/hejin1026)
* [@farhadi](https://github.com/farhadi)

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*EMQ* is a distributed, massively scalable, highly extensible MQTT message broker written in Erlang/OTP.
emqttd is fully open source and licensed under the Apache Version 2.0. emqttd implements both MQTT V3.1 and V3.1.1 protocol specifications, and supports WebSocket, STOMP, SockJS, CoAP and MQTT-SN at the same time.
*EMQ* is fully open source and licensed under the Apache Version 2.0. *EMQ* implements both MQTT V3.1 and V3.1.1 protocol specifications, and supports MQTT-SN, CoAP, WebSocket, STOMP and SockJS at the same time.
emqttd requires Erlang R18+ to build since 1.1 release.
The *EMQ* project provides a scalable, reliable, enterprise-grade MQTT message Hub for IoT, M2M, Smart Hardware and Mobile Messaging Applications.
Follow us on Twitter: [@emqtt](https://twitter.com/emqtt)
The 1.0 release of the *EMQ* broker is scaling to 1.3 million concurrent MQTT connections on a 12 Core, 32G CentOS server.
## Cluster
The **q.emqtt.com** hosts a public emqttd cluster on [QingCloud](https://qingcloud.com):
![qing_cluster](http://emqtt.io/static/img/public_cluster.png)
## Goals
The emqttd project is aimed to implement a scalable, distributed, extensible open-source MQTT broker for IoT, M2M and Mobile applications that hope to handle millions of concurrent MQTT clients.
* Easy to install
* Massively scalable
* Easy to extend
* Solid stable
The Company behind the open source *EMQ* broker: [emqtt.io](http://emqtt.io). Follow us on Twitter: [@emqtt](https://twitter.com/emqtt)
## Features
* Full MQTT V3.1/V3.1.1 protocol specification support
* QoS0, QoS1, QoS2 Publish and Subscribe
* Full MQTT V3.1/V3.1.1 support
* QoS0, QoS1, QoS2 Publish/Subscribe
* Session Management and Offline Messages
* Retained Message
* Last Will Message
@ -42,17 +29,44 @@ The emqttd project is aimed to implement a scalable, distributed, extensible ope
* IpAddress Authentication
* Username and Password Authentication
* Access control based on IpAddress, ClientID, Username
* Authentication with LDAP, Redis, MySQL, PostgreSQL and HTTP API
* Cluster brokers on several servers
* LDAP Authentication/ACL
* HTTP Authentication/ACL
* MySQL Authentication/ACL
* Redis Authentication/ACL
* PostgreSQL Authentication/ACL
* MongoDB Authentication/ACL
* Cluster brokers on several nodes
* Bridge brokers locally or remotely
* mosquitto, RSMB bridge
* Extensible architecture with Hooks, Modules and Plugins
* Extensible architecture with Hooks and Plugins
* Passed eclipse paho interoperability tests
* Local Subscription
* Shared Subscription
## Installation
The *EMQ* broker is cross-platform, which could be deployed on Linux, FreeBSD, Mac, Windows and even Raspberry Pi.
Download the binary package for your platform from http://emqtt.io/downloads.
Documentation on [emqtt.io/docs/v2/](http://emqtt.io/docs/v2/), [docs.emqtt.com](http://docs.emqtt.com/en/latest/) for installation and configuration guide.
## Build From Source
The *EMQ* broker requires Erlang/OTP R18+ to build.
```
git clone https://github.com/emqtt/emq-relx.git
cd emq-relx && make
cd _rel/emqttd && ./bin/emqttd console
```
## Plugins
The *EMQ* broker is highly extensible, with many hooks and plugins for customizing the authentication/ACL and integrating with other systems:
Plugin | Description
-----------------------------------------------------------------------|--------------------------------------
[emq_plugin_template](https://github.com/emqtt/emq_plugin_template) | Plugin template and demo
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[emq_reloader](https://github.com/emqtt/emq_reloader) | Reloader Plugin
[emq_sockjs](https://github.com/emqtt/emq_sockjs) | SockJS(Stomp) Plugin
## Dashboard
A Web Dashboard will be loaded when the emqttd broker started successfully.
The Dashboard helps monitor broker's running status, statistics and metrics of MQTT packets.
Default Address: http://localhost:18083
Default Login/Password: admin/public
## Design
![emqttd architecture](http://emqtt.io/static/img/architecture.png)
## QuickStart
Download binary package for Linux, Mac and Freebsd from [http://emqtt.io/downloads](http://emqtt.io/downloads).
Installing on Ubuntu64, for example:
```sh
unzip emqttd-ubuntu64-2.0-rc.2-20161019.zip && cd emqttd
# start console
./bin/emqttd console
# start as daemon
./bin/emqttd start
# check status
./bin/emqttd_ctl status
# stop
./bin/emqttd stop
```
Installing from source:
```
git clone https://github.com/emqtt/emq-relx.git
cd emq-relx && make
cd _rel/emqttd && ./bin/emqttd console
```
## Documents
Read Documents on [emqttd-docs.rtfd.org](http://emqttd-docs.rtfd.org) for installation and configuration guide.
## Benchmark
Latest release of emqttd broker is scaling to 1.3 million MQTT connections on a 12 Core, 32G CentOS server.
Benchmark 0.12.0-beta on a CentOS6 server with 8 Core, 32G memory from QingCloud:
250K Connections, 250K Topics, 250K Subscriptions, 4K Qos1 Messages/Sec In, 20K Qos1 Messages/Sec Out, 8M+(bps) In, 40M+(bps) Out Traffic
Consumed about 3.6G memory and 400+% CPU.
Benchmark Report: [benchmark for 0.12.0 release](https://github.com/emqtt/emqttd/wiki/benchmark-for-0.12.0-release)
## Supports
* Twitter: [@emqtt](https://twitter.com/emqtt)
* Homepage: http://emqtt.io
* Downloads: http://emqtt.io/downloads
* Wiki: https://github.com/emqtt/emqttd/wiki
* Documentation: http://emqtt.io/docs/v2/
* Forum: https://groups.google.com/d/forum/emqtt
* Mailing List: <emqtt@googlegroups.com>
* Issues: https://github.com/emqtt/emqttd/issues
* QQ Group: 12222225
## Contributors
* [@callbay](https://github.com/callbay)
* [@lsxredrain](https://github.com/lsxredrain)
* [@hejin1026](https://github.com/hejin1026)
* [@desoulter](https://github.com/desoulter)
* [@turtleDeng](https://github.com/turtleDeng)
* [@Hades32](https://github.com/Hades32)
* [@huangdan](https://github.com/huangdan)
* [@phanimahesh](https://github.com/phanimahesh)
* [@dvliman](https://github.com/dvliman)
## Partners
[QingCloud](https://qingcloud.com) is the worlds first IaaS provider that can deliver any number of IT resources in seconds and adopts a second-based billing system. QingCloud is committed to providing a reliable, secure, on-demand and real-time IT resource platform with excellent performance, which includes all components of a complete IT infrastructure system: computing, storage, networking and security.
## Author
The **q.emqtt.com** hosts a public Four-Node *EMQ* cluster on [QingCloud](https://qingcloud.com):
Feng Lee <feng@emqtt.io>
![qing_cluster](http://emqtt.io/static/img/public_cluster.png)
## License