Exporting Notebooks

[talal]

First of all thanks for the wonderful app 😄

Would it be possible for you to add an export option for the individual notebooks so that we can export the list of words a simple text file? I think this feature would be a great addition as this would allow us to backup our notebooks.

A step further would be to have a dedicated backup option in the settings where we could specify a folder and then the app would automatically backup all the notebooks at regular intervals but I can understand if this is too much work.