FreeCodeCamp API Project: File Metadata Microservice

User stories:

1. I can submit a FormData object that includes a file upload.
2. When I submit something, I will receive the file size in bytes within the JSON response

Example query usage:

Upload file from the UI at the root.

https://gentle-spire-43825.herokuapp.com/

Example query output:

https://gentle-spire-43825.herokuapp.com/get-file-size

{
size: 44667
}