Add works with dotenv-vault badge

[motdotla]

Hey 👋 Luos team,

I continue to think it is very cool that you are using dotenv-vault in an opensource project. Here's a badge if you would like to show that off.

If there are other ways we can make dotenv-vault more useful to your open source users let us know as well. Maybe somehow automating their .env creation more easily. I'm all ears!

⚠ PLEASE DO NOT DELETE THE TEXT BELOW ⚠

Pull request's description

Added 'works with dotenv-vault' badge

Checklist before merging (please do not edit)

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  ```c
  
  // Some C language
  
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