dotnet-on-Ubuntu.md

@@ -1,7 +1,7 @@
 https://docs.microsoft.com/en-us/dotnet/core/install/linux-ubuntu
 
 One-time setup:
-```
+```shell
 wget https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
 sudo dpkg -i packages-microsoft-prod.deb
 sudo apt update
@@ -9,7 +9,7 @@ sudo apt install dotnet-sdk-5.0
 ```
 
 Create and run a sample Hello World project:
-```
+```shell
 dotnet new console -o hello
 cd hello
 dotnet build