Feature: Add Support for Env File Drag and Drop

[babblebey]

Hello EnvShare Team,

I hope this message finds you well. I wanted to express my appreciation for the EnvShare project and the fantastic user interface it provides. In fact, I was inspired by your UI and implemented a copy of it in my own project, private-key-converter.

I recently added a file drag and drop feature babblebey/private-key-converter#7 to my project, and I believe it would be a great addition to EnvShare as well. This feature allows users to drag and drop files directly onto the webpage for upload, providing a more intuitive and seamless user experience.

I would be happy to contribute the code for this feature to the EnvShare project if it aligns with your vision. Please let me know if this is something you would be interested in, and I can work on preparing a pull request.

Thank you for considering this request, and keep up the fantastic work on EnvShare!

PS: Yes, I had to make this Issue look like a formal letter, so you know that I am super serious 😆😆😆😆😆😆