Please add ability to add events to demo

[fancydev18]

Hi,

Trying the demo at https://stormseed.github.io/daykeep-calendar-quasar/#/
When clicking on a time slot, nothing happens.

Expected: popup a dialog box and ask for meeting name. Click Save and have that event added to calendar.
There's no need to persist events added this way between page reloads.

Thanks!