add add user method

internal/services/users_service/service.go

@@ -0,0 +1,31 @@
+package users_service
+
+import (
+	"context"
+	"evening_detective_server/internal/repos/users_repo"
+)
+
+type UsersService struct {
+	usersRepo *users_repo.UsersRepo
+}
+
+func NewUsersService(usersRepo *users_repo.UsersRepo) *UsersService {
+	return &UsersService{
+		usersRepo: usersRepo,
+	}
+}
+
+func (s *UsersService) AddUser(
+	ctx context.Context,
+	username string,
+	email string,
+) error {
+	err := s.usersRepo.AddUser(
+		ctx,
+		username,
+		email,
+		"hello", // TODO: generate password and send email
+		"user",
+	)
+	return err
+}