install nvm and npm code example

Example 1: use nvm to install latest node

//lists all versions
nvm ls-remote

//installs the version you want (in this case version 14.0.0)
nvm install v14.0.0

//use the version that you installed as the default
nvm use v14.0.0

Example 2: install nvm

wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.37.2/install.sh | bash