Adding toDo app functionability

added Required label

requested review from @gajesh24 and @strokh24

Perhaps it'd be useful to implement some sort of max character size for tasks?

This perhaps should be applied to all <input>s in login.html and register.html forms.

Note that now the long task doesn't have the "complete", "edit" or "delete" buttons visible from the UI

To begin with - this is kind of a mess up from my side, for not specifying it more precisely.

While I love the actual implementation of how tasks are currently shown and completed, I'm not sure whether they adhere to the actual task inside of the Lecturer's PDF:

Would love to hear your thoughts on this! From my view, perhaps when an entry is completed, it should be completely hidden? Afterwards a button could be added at the top to show the completed ones (like screenshot below)