[Feature request] Customlized keymap & default new file name

[FlyinCow]

People using other editors maybe have their own keymaps and they always want same experiences among different editors. For me it's quite unconvinient withou "ctrl+shift+enter" as "insert new line before current".

And another thing is that sometimes I want to create an new markdown file but literally I can't. I can just create an new txt and rename it. You can make it like, you clikc the filename on the tab and you can rename it, or put a item in the menu to create a file with different types and locations.

Really a nice editer, I like it so much.

[0x7c13]

I had an idea of making "Add" button an option menu with:

1. TXT Document
2. Markdown
3. Rich Text (Comes later)
   And by default, ctrl+T/N will open TXT.

As well as for the shortcuts, I planned to add most useful ones like Ctrl+D to copy current line into down below. I will definitely consider adding ctrl+shift+enter as inserting new line above.