Update to README

Update to README

Update README

Adjust buildpacks on Heroku

added requirements.txt

Added README and updated app

fixed app's yearly view functionality to work even if the user does not input a month

added yearly view functionality

fixed edit event functionality and added dark and light mode for calendar

added color categories, and functionality for next and previous months

updated logic for sidebar and updated new event as a pop up modal

added event functionality, changed design of calendar and added a sidebar for today's events

first commit