install react-calendar and create a Calendar component

[QueMona98]

We will be using the following package for creating the calendar:

https://www.npmjs.com/package/react-calendar

Here is a tutorial, too:

https://medium.com/how-to-react/create-a-calendar-in-react-js-e48e43ab3a19

Please note that the key part of this issue is determining if the react-calendar component can be stretched to fit the entire webpage of calendar.js. If it can't, then please let me know and we will instead transition to creating our own calendar component.