Create new config file for optional gossip local node configuration

[timo0]

The config file should be in yaml format and should support lists.

Eg:

gossip:
  interfaceBindings:
    - { "nodeId": 0, "hostname": "10.10.10.1", "port": 1234 }
    - { "nodeId": 0, "hostname": "10.10.10.2", "port": 1234 }
    - { "nodeId": 1, "hostname": "10.10.10.3", "port": 1234 }
    - { "nodeId": 4, "hostname": "2001:db8:3333:4444:5555:6666:7777:8888", "port": 1234 }
  randomStringValue: "random"