endpoint + SQL Query to Add value to a KPI PUT Method

[maalej]

the interface will come soon.

This is to submit KPI value for the economist

Related to #40

[maalej]

Given a KPI Id, the frontend submits the kpi_value and the kpi_date in order to insert them into the fills_in table PUT method: on

PUT kpi/kpi_id/add-value

interface is:

{
value: '55',
date: '2023-01-01',
}

[Daria-Oni]