Ability to create/update entries in Vault

[matthewmrichter]

Maybe this is implied but I figured I would put in an issue so it can be tracked.. but this tool would be much more useful if we could create or update secrets once authenticated as well.

[nyxcharon]

Yeah, this is a planned feature for sure but i've been waiting to finish #11 first.

[amosshapira]

I'm interested in this UI to see if it can help us let our internal users self-manage their OpenVPN SSL certificates.