docs: include WEEKDAY in formula

packages/noco-docs/content/en/setup-and-usages/formulas.md

@@ -90,6 +90,10 @@ Example: ({Column1} + ({Column2} * {Column3}) / (3 - $Column4$ ))
 |  |  | `DATEADD(date, 1, 'month')` | Supposing {DATE_COL} is 2022-03-14 03:14. The result is 2022-04-14 03:14. | DateTime columns and negative values are supported. Example: `DATEADD(DATE_TIME_COL, -1, 'month')` |
 |  |  | `DATEADD(date, 1, 'year')` | Supposing {DATE_COL} is 2022-03-14 03:14. The result is 2023-03-14 03:14. | DateTime columns and negative values are supported. Example: `DATEADD(DATE_TIME_COL, -1, 'year')` |
 |  |  | `IF(NOW() < DATEADD(date,10,'day'), "true", "false")` | If the current date is less than {DATE_COL} plus 10 days, it returns true. Otherwise, it returns false. | DateTime columns and negative values are supported. |
+|  |  | `IF(NOW() < DATEADD(date,10,'day'), "true", "false")` | If the current date is less than {DATE_COL} plus 10 days, it returns true. Otherwise, it returns false. | DateTime columns and negative values are supported. |
+| **WEEKDAY** | `WEEKDAY(date, [startDayOfWeek])` | `WEEKDAY(NOW())` | If today is Monday, it returns 0 | Returns the day of the week as an integer between 0 and 6 inclusive starting from Monday by default. You can optionally change the start day of the week by specifying in the second argument |
+|  |  | `WEEKDAY(NOW(), "sunday")` | If today is Monday, it returns 1 | Get the week day of NOW() with the first day set as sunday |
+
 ### Logical Operators
 
 | Operator | Sample               | Description              |