Add handler auth

backend/models/user.go

@@ -0,0 +1,10 @@
+package models
+
+import "gorm.io/gorm"
+
+type User struct {
+	gorm.Model `json:"-"`
+	Username   string `gorm:"unique;not null"`
+	Password   string `gorm:"not null" json:"-"`
+	Role       string `gorm:"default:'Рабочий'" json:"role"`
+}