Create simple CLI app for configuring the system (Meteo)

[opalenic]

It should be able to add/remove/update sensor nodes, add/remove/update sensors in sensor nodes, and to display the current system configuration.

[opalenic]

meteo_cli subcommands:

• [x] list
• • [x] nodes
• • [x] sensors
• [x] add
• • [x] node
• • [x] sensor
• [ ] modify
• • [ ] node [-n new_node_name] [-t new_route_type]
• • [ ] sensor [-n new_sensor_name]
• [ ] rm
• • [ ] node [-f] [-q]
• • [ ] sensor [-f] [-q]
• • [ ] measurement [datetime_to]