Simplify installation commands in README.md

Author: NikolayIT

README.md

@@ -16,11 +16,11 @@ A ready-to-use template for ASP.NET Core with repositories, services, models map
 You can install this template using [NuGet](https://www.nuget.org/packages/AspNetCoreTemplate):
 
 ```powershell
-dotnet new --install AspNetCoreTemplate
+dotnet new -i AspNetCoreTemplate
 ```
 
 ```powershell
-dotnet new aspnet-core-template -n YourProjectName
+dotnet new aspnet-core -n YourProjectName
 ``` 
 
 ## Project Overview