Add keyboard shortcuts widget

[Rossi1337]

I just downloaded the 0.1release and really like it.

One thing that would help a lot would be a hotkey to "send message", maybe CTRL + ENTER or something similar. Currently I have to switch to the mouse when I have finished writing my prompt. This is the most annoying thing when using the UI. I would also propose to add a shortcut for the "New Chat" button, maybe CTRL + N. These two are the actions I would mostly do with the keyboard while I chat.

Another thing is that the UI does not scroll automatically to the bottom when new output is produced. This again forces me to switch to the mouse to manually scroll down to read the text.

Would be nice if I could do this with the UP and DOWN keys to scroll line by line or PAGE UP and PAGE DOWN keys to scroll a "page" up and down