feat: document new setup

README.md

@@ -15,7 +15,8 @@
 - `PAGERDUTY_READ_ONLY_TOKEN` is used for reading schedules and checking the overlaps.
 - `SCHEDULES` array can contain one or more `SCHEDULE` items to check
 - every `SCHEDULE` should have a `NOTIFICATIONS` to create incident or send message if overlap is found
-- `SCHEDULE` can contain a `DAYS` key, which speficies numbers of days in UTC (0 = Sunday) for verification (`[0, 1, 2, 3, 4]` below represents days without weekend)
+- `SCHEDULE` can contain a `EXCLUSION_DAYS` key, which specifies days (3 letter abb.) in form of object with optional `start` and `end` time (`hh:mm` format). If `start` or `end` is omitted, whole day is considered excluded. 
+Example below represents current weekend on-call setup. All datetimes are translated to UTC, so feel free to use a local time.
 
 Currently, we only support Slack (`SLACK` with `SLACK_WEBHOOK_URL` and `CHANNEL`) and PagerDuty (`PAGERDUTY_TOKEN`) notifications.
 
@@ -37,7 +38,7 @@ Currently, we only support Slack (`SLACK` with `SLACK_WEBHOOK_URL` and `CHANNEL`
 		"NOTIFICATIONS": {
 			"PAGERDUTY_TOKEN": "22222222222222222222"
 		},
-		"DAYS": [0, 1, 2, 3, 4]
+		"EXCLUSION_DAYS": {"Fri": {"start": "16:00", "end": "23:59"}, "Sat": {}, "Sun": {"start": "00:00", "end": "16:00"}}
 	}]
 }
 ```