Add autocompletion for nushell

**Related command**
All commands

**Describe the solution you'd like**
To have the same auto complete feature for nushell than there is already for other shell (bash, powershell)

**Describe alternatives you've considered**
Implement myself a custom script to have auto complete, but it would never be up to date.

**Additional context**
I am using nushell 👉https://www.nushell.sh/