Merge pull request 'Identifier formats json et csv permis lors d'insertion' (#44) from fix/identifier-support-formats-insertion into main

Reviewed-on: #44

handlers/insert.go

@@ -43,7 +43,7 @@ func (h *Handler) PostMembres(c echo.Context) error {
 		}
 	default:
 		response.StatusCode = http.StatusBadRequest
-		response.Message = "Invalid Content-Type"
+		response.Message = "Invalid Content-Type: Please use application/json or text/csv"
 		return c.JSON(response.StatusCode, response)
 	}