Update README.md and doc

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

README.md

@@ -33,7 +33,8 @@ See the [中文文档](https://github.com/alibaba/Sentinel/wiki/%E4%BB%8B%E7%BB%
 
 See the [Wiki](https://github.com/alibaba/Sentinel/wiki) for full documentation, examples, blog posts, operational details and other information.
 
-**If you are using Sentinel, please [leave a comment here](https://github.com/alibaba/Sentinel/issues/18) to tell us your scenario to make Sentinel better :-)**
+If you are using Sentinel, please [**leave a comment here**](https://github.com/alibaba/Sentinel/issues/18) to tell us your scenario to make Sentinel better.
+It's also encouraged to add the link of your blog post, tutorial, demo or customized components to [**Awesome Sentinel**](./doc/awesome-sentinel.md).
 
 ## Quick Start
 
@@ -139,6 +140,8 @@ Contact us: sentinel@linux.alibaba.com
 
 Contributions are always welcomed! Please see [CONTRIBUTING](./CONTRIBUTING.md) for detailed guidelines.
 
+You can start with the issues labeled with [`good first issue`](https://github.com/alibaba/Sentinel/pulls?q=is%3Apr+is%3Aopen+label%3A%22good+first+issue%22).
+
 ## Credits
 
 Thanks [Guava](https://github.com/google/guava), which provides some inspiration on rate limiting.

doc/README.md

@@ -1 +1,3 @@
-# Sentinel Documents
+# Sentinel related documents
+
+- [Awesome Sentinel](./awesome-sentinel.md)

doc/awesome-sentinel.md

@@ -5,7 +5,7 @@
 A curated list of awesome things (e.g. sample, extensions, blogs) for [Sentinel](https://github.com/alibaba/Sentinel).
 
 If you want your component to appear here, send a pull request to this repository to add it.
-You can refer to the [contribution guidelines](https://github.com/sentinel-group/sentinel-awesome/blob/master/CONTRIBUTING.md).
+You can refer to the [awesome contribution guidelines](https://github.com/sentinel-group/sentinel-awesome/blob/master/CONTRIBUTING.md).
 
 You can also add to [sentinel-group/sentinel-awesome](https://github.com/sentinel-group/sentinel-awesome).
 
@@ -31,14 +31,5 @@ You can also add to [sentinel-group/sentinel-awesome](https://github.com/sentine
 ## Blogs
 
 - [Sentinel 为 Dubbo 服务保驾护航](http://dubbo.apache.org/zh-cn/blog/sentinel-introduction-for-dubbo.html) by [Eric Zhao](https://github.com/sczyh30)
-- [Sentinel 一体化监控解决方案 CrateDB + Grafana](https://blog.csdn.net/huyong1990/article/details/82392386) by [Young Hu](https://github.com/YoungHu)
-- [在生产环境中使用 Sentinel 控制台](https://github.com/alibaba/Sentinel/wiki/%E5%9C%A8%E7%94%9F%E4%BA%A7%E7%8E%AF%E5%A2%83%E4%B8%AD%E4%BD%BF%E7%94%A8-Sentinel-%E6%8E%A7%E5%88%B6%E5%8F%B0) by [Eric Zhao](https://github.com/sczyh30)
-- [限流降级神器-哨兵(Sentinel)原理分析](https://mp.weixin.qq.com/s/7_pCkamNv0269e5l9_Wz7w) by [houyi](https://github.com/all4you)
-- [限流降级神器-哨兵(Sentinel)的资源调用链原理分析](https://mp.weixin.qq.com/s/UEzwD22YC6jpp02foNSXnw)  by [houyi](https://github.com/all4you)
-- [限流降级神器-哨兵(Sentinel)基于滑动时间窗口的实时指标统计分析](https://mp.weixin.qq.com/s/B1_7Kb_CxeKEAv43kdCWOA)  by [houyi](https://github.com/all4you)
-- [Sentinel 控制台监控数据持久化【MySQL】(Spring Data JPA)](https://www.cnblogs.com/cdfive2018/p/9838577.html) by [cdfive](https://github.com/cdfive)
-- [Sentinel 控制台监控数据持久化【InfluxDB】](https://www.cnblogs.com/cdfive2018/p/9914838.html) by [cdfive](https://github.com/cdfive)
-- [Sentinel学习笔记（1）-- 流量统计代码解析](https://www.jianshu.com/p/7936d7a57924)  by [ro9er](https://github.com/ro9er)
-- [Sentinel学习笔记（2）-- 流量控制代码分析](https://www.jianshu.com/p/938709e94e43)  by [ro9er](https://github.com/ro9er)
-- [Sentinel学习笔记（3）-- 上下文统计Node建立分析](https://www.jianshu.com/p/cfdf525248c1)  by [ro9er](https://github.com/ro9er)
-- [大流量下的服务质量治理 Dubbo Sentinel初涉](https://mp.weixin.qq.com/s/ergr_siI07VwwSRPFgsLvQ)  by [RyuGrade](https://github.com/RyuGrade)
+- [Sentinel 与 Hystrix 的对比](https://github.com/alibaba/Sentinel/wiki/Sentinel-%E4%B8%8E-Hystrix-%E7%9A%84%E5%AF%B9%E6%AF%94)
+- [Guideline: 从 Hystrix 迁移到 Sentinel](https://github.com/alibaba/Sentinel/wiki/Guideline:-%E4%BB%8E-Hystrix-%E8%BF%81%E7%A7%BB%E5%88%B0-Sentinel)