Embed username and description inside the key file.

I added two arguments User and Description so we can later make v-list-api-keys which should show you all keys for your username and also a description so you don't delete the wrong key when you use v-delete-api-key
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Let me know what you think, If you haven't already started on v-list-api-keys, I could help you with it or start on v-delete-api-key