Update dotnet with EF Core tools

src/dotnet.md

@@ -10,3 +10,13 @@ $Env:NETCORE_ENVIRONMENT = "Development"
 ```
 
 The `ASPNETCORE_ENVIRONMENT` value overrides `DOTNET_ENVIRONMENT`.
+
+## Entity Framework Core Tools
+[CLI reference](https://docs.microsoft.com/en-us/ef/core/cli/dotnet).
+
+```powershell
+# Install
+dotnet tool install --global dotnet-ef
+# Update
+dotnet tool update --global dotnet-ef
+```