install .net sdk on ubuntu code example

Example: install .net sdk on ubuntu

# with Snap
sudo snap install dotnet-sdk --classic --channel=5.0

#with apt
wget https://packages.microsoft.com/config/ubuntu/21.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
sudo dpkg -i packages-microsoft-prod.deb
sudo apt-get install -y apt-transport-https
 sudo apt-get install -y dotnet-sdk-5.0