Implement commands

[ammarbinfaisal1]

there should be user commands in list mode like
:q to exit
:s to save all the edited tasks - this one would be need if user doesnt want to press ctrl+s after editing each task just edits a bunch of them and then saves all.

[ammarbinfaisal1]

@GaurangTandon any other command which can be there. or I was thinking of having just keystrokes for everything that would be simpler but then which keyfor exit :/

[GaurangTandon]

I think :w and :q would be sufficient enough. Can't think of anything else right now :/