Create and edit text files

[hacdias]

Is your feature request related to a problem? Please describe.

No.

Describe the solution you'd like

It'd be interesting to be able to create text files and edit them! We already have the editor for the config. We just need to... reuse it 😄

Describe alternatives you've considered

Edit/update files via the command line?

Additional context

N/A

[lidel]

cc ipfs/ipfs-gui#69 :^)