Update user to powered-by doc.

README.md

@@ -39,6 +39,9 @@ for different scenarios. For better understanding, read our documents.
 # Document
 - [Documents in English](docs/README.md)
 
+# Downloads
+Please head to the [releases page](ttp://skywalking.apache.org/downloads/) to download a release of Apache SkyWalking.
+
 
 # Code of conduct
 This project adheres to the Contributor Covenant [code of conduct](CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code. Please report unacceptable behavior to wusheng@apache.org.
@@ -63,11 +66,13 @@ Follow this [document](https://github.com/apache/incubator-skywalking/blob/maste
 * [Gitter](https://gitter.im/openskywalking/Lobby)
 * QQ Group: 392443393
 
-# Users
+# Who Uses SkyWalking?
+A wide variety of companies and organizations use SkyWalking for research, production and commercial product.
+Here is the **User Wall** of SkyWalking.
+
 <img src="https://skywalkingtest.github.io/page-resources/users/users-2018-08-12.png"/>
 
-- [Users list](docs/users.md)
-- [Submit new user to us.](https://github.com/apache/incubator-skywalking/issues/443)
+Users are encouraged to add themselves to the [PoweredBy](docs/powered-by.md) page.
 
 <p align="center">
 <a href="https://openapm.io"><img src="https://openapm.io/static/media/openapm_logo.svg" width="100"/></a> 

docs/users.md → docs/powered-by.md

-# Users
+# Powered by Apache SkyWalking
+This page documents an alphabetical list of institutions that are using Apache SkyWalking for research and production,
+or providing commercial products including Apache SkyWalking.
 
-All users are reported through direct message/mail or [online issue](https://github.com/apache/incubator-skywalking/issues/443), 
-if any entity(company or organization) has any doubt, please contact us by [any official channel](../README.md#contact-us).
 
 - 300.cn 中企动力科技股份有限公司 http://www.300.cn/
 - 4499.com 四三九九网络股份有限公司. http://www.4399.com/
@@ -29,8 +29,8 @@ if any entity(company or organization) has any doubt, please contact us by [any
 - Moji 墨叽（深圳）科技有限公司 https://www.mojivip.com
 - Qsdjf.com 浙江钱宝网络科技有限公司 https://www.qsdjf.com/index.html
 - Rongjinbao. 深圳融金宝互联网金融服务有限公司. http://www.rjb777.com
-- Successchannel 苏州渠成易销网络科技有限公司. http://www.successchannel.com
 - Shouqi Limousine & chauffeur Group 首约科技(北京)有限公司. https://www.01zhuanche.com/
+- Successchannel 苏州渠成易销网络科技有限公司. http://www.successchannel.com
 - Today36524.com Today便利店
 - Tsfinance.com 重庆宜迅联供应链科技有限公司 https://www.tsfinance.com.cn/
 - VBill Payment Co., LTD. 随行付. https://www.vbill.cn/