[Example] Flutter - Uploading Videos

[aashish-g03]

Hi @colbyfayock ,

I noticed there isn't any example regarding uploading videos to Cloudinary with Flutter. I'd like to contribute by creating an example that demonstrates how to upload videos using the Cloudinary Flutter SDK. Can I work on that?

Looking forward to your feedback!

[colbyfayock]

@aashish-g03 as commented in the other Issue, let's start with 1 at a time. Once you complete that you can work on this too. Thanks for your input!