Update README.md

Author: maurizuki

src/ConsoleTree.FileSystem/README.md

@@ -4,13 +4,13 @@ A tool to write the directory tree to the console standard output stream, with c
 
 ## Getting started
 
-To add ConsoleTree.FileSystem to your project, you can use the following NuGet Package Manager command:
+Use the following command to add the package to a .NET project:
 
 ```PowerShell
-Install-Package ConsoleTree.FileSystem
+dotnet add package ConsoleTree.FileSystem
 ```
 
-More options are available on the [ConsoleTree.FileSystem page](https://www.nuget.org/packages/ConsoleTree.FileSystem) of the NuGet Gallery website.
+More options are available on the [package page](https://www.nuget.org/packages/ConsoleTree.FileSystem) of the NuGet Gallery website.
 
 ## Usage
 Instantiate a ```FileSystemNode``` specifying the root directory and, optionally, if files must be included, a function to filter them and a sort order. To write the directory tree to the console standard output stream, call the ```ConsoleTree.Tree.Write``` method specifying the ```FileSystemNode``` instance as parameter.