[FEATURE] Allow chelsea to set config for Nexus IQ Server

[DarthHater]

So that someone can provide their server url, username and token for communicating with Nexus IQ Server, we could create a way for someone to set a more persistent config.

In the other tools we have worked on we created an interactive experience on the command line for setting config.

We ask for:

• Server URL
• Username
• Token (and we emphasize token, not password)

We save this by default to:
~/.iqserver/.iq-config

As yaml, with the keys: Server, Username and Token, as this config can be shared amongst all the tools.

This work could also add command line flags for server, username and token for Nexus IQ Server.