doc(Readme.md): add another way to install the package.

SanftMonster · web-flow · commit 2053b5a92e12 · 2022-05-20T01:41:55.000+08:00
diff --git a/Readme.md b/Readme.md
@@ -40,6 +40,12 @@ The following features will be provided in the future.
 PM> Install-Package Tensor.NET
 ```
 
+or 
+
+```
+$ dotnet add package Tensor.NET
+```
+
 
 ## Documention
 
