Add documentation on how to import/install extensions as a list.

Issue:

There needs to be a README (with possible working script) to be able to install extensions from a file.

Description:

Currently in Visual Studio Code documentation there are only those commands to manage extensions:

code --list-extensions
code --install-extension ms-vscode.cpptools
code --uninstall-extension ms-vscode.csharp
code --disable-extensions

Possible solution:

Write down a script in bash, Powershell which will automatically install extensions for the user.