Feature: Get any Video or Image Dimensions via upload or url

[ThatGuySam]

The idea is similar to #14 but as soon as possible respond with the media dimensions.

From Stack Overflow

• https://stackoverflow.com/questions/7460272/getting-image-dimensions-using-javascript-file-api

Here's a theoretical example usage with via Fetch API upload

const videoInput = document.querySelector('input[type="file"]')

const data = new FormData()
data.append('file', videoInput.files[0])

fetch('https://vumbnail.com/upload.dimensions.json', {
  method: 'POST',
  body: data
})

Also, simple image tag / GET request

<!-- source video: https://mywebsite.com/video.mp4 -->
<img src="https://vumbnail.com/mywebsite.com/video.mp4.dimensions.json" />