This is the news document which will be inserted
inside the proper collection (ex economy, sport, politics)

{
	"title": "title",
	"author":{
		"_id": "author's id",
		"name": "author's name"
	},
	"preview": "preview image",
	"content": "text of the news",
	"datetime": "pubblication date",
	"photos": [
		"photo1",
		"photo2",
		"photo3"
	],
	"videos": [
		"video1",
		"video2"
	],
	"comments": [
		{
			"id": 1,
			"author": "author's name",
			"text": "comment",
			"datetime": "datetime",
			"parents": [],
			"replies":[
				{
					"id": 2,
					"author": "author's name",
					"text": "comment",
					"datetime": "datetime",
					"parents": [1],
					"replies":[
						{
							"id": 4,
							"author": "author's name",
							"text": "comment",
							"datetime": "datetime",
							"parents": [1,2]
						},
						{
							"id": 6,
							"author": "author's name",
							"text": "comment",
							"datetime": "datetime",
							"parents":[1,2]
						}
					]
				},
				{
					"id": 5,
					"author": "author's name",
					"text": "comment",
					"datetime": "datetime",
					"parents": [1],
					"replies":[]
				}
			]
		},
		{
			"id": 3,
			"author": "author's name",
			"text": "comment",
			"datetime": "datetime",
			"parents": [],
			"replies":[]
		}
	],
	"feedbacks": {
		"excellent": "number of excellent votes",
		"good": "number of good votes",
		"average": "number of average votes",
		"poor": "number of poor votes",
		"bad": "number of bad votes"
	}
}