dotnet-on-Ubuntu.md

@@ -0,0 +1,18 @@
+https://docs.microsoft.com/en-us/dotnet/core/install/linux-ubuntu
+
+One-time setup:
+```
+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
+sudo apt install dotnet-sdk-5.0
+```
+
+Create and run a sample Hello World project:
+```
+dotnet new console -o hello
+cd hello
+dotnet build
+dotnet run
+```
+