Add all required parameters to ssl-proxy config in README.md.

[aacic]

As explained here:

cameronhunter/local-ssl-proxy#113

local-ssl-proxy config should look like this:

"Host": {
        "source": 8080,
        "target": 8081,
        "key": "localhost-key.pem",
        "cert": "localhost.pem",
        "hostname": "localhost"
    }

Description

Checklist

• Added proper unit tests
• Left proper TODO messages for any remaining tasks
• Scanned for web accessibility with aXe, and mitigated or documented
  flagged issues

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