Add Firestore backend DB

[ethanl21]

I'm working on the back-end implementation for our website. I'll be working on the following:

• "Add New Item" React component
• Storing all the items that can be rated (name, description, image, avg rating)
• Storing a user's ratings (id of item, rating value)

Since our site's frontend is still pretty minimal, I put the component I made on the front page under the authentication component I made so I can see how it looks. If the home page gets implemented while I'm still working on this branch, I'll delete what I changed.

[ethanl21]

Backend Data Description and API

[ethanl21]

Add New Item Component

[github-actions]

Visit the preview URL for this PR (updated for commit e0dd7d6):

https://retroratings--pr4-firestore-db-18l43fjs.web.app

_{(expires Fri, 03 Nov 2023 22:43:27 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: 8c8029c398d88e68d291880754a7579347647b27}

[ethanl21]

I'm still working on this. I figured out how to allow users to upload images to Firebase Storage and I added functionality to the AddNewItemCard component that I made (items uploaded using the card will be added to the database, only if the user is logged in)

I'm still working on implementing functions to read from the database and to add a rating to an item. Since I have a better understanding of Firestore now, it shouldn't take me too long.

[ethanl21]

I'm very close to finishing this, all I have left are a few things:

• Allow users to update ratings
• Allow users to delete ratings
• Update average rating when users create, update, or delete a rating