Update Getting-Started.md(Tiered project require redis)

Resolve #2804

docs/en/Getting-Started.md

@@ -25,6 +25,12 @@ The following tools should be installed on your development machine:
 
 * [Node v12+](https://nodejs.org)
 * [Yarn v1.19+](https://classic.yarnpkg.com/)
+{{ if Tiered == "Yes" }}
+
+* [Redis](https://redis.io/): The applications use Redis as as [distributed cache](../Caching.md). So, you need to have Redis installed & running.
+
+{{ end }}
+
 
 > You can use another editor instead of Visual Studio as long as it supports .NET Core and ASP.NET Core.
 

docs/zh-Hans/Getting-Started.md

@@ -24,6 +24,11 @@
 
 * [Node v12+](https://nodejs.org)
 * [Yarn v1.19+](https://classic.yarnpkg.com/)
+{{ if Tiered == "Yes" }}
+
+* [Redis](https://redis.io/): 应用程序将Redis用作[分布式缓存](../Caching.md). 因此你需要安装并运行Redis.
+
+{{ end }}
 
 > 你可以也使用其他支持.NET Core 和 ASP.NET Core的编辑器.