fix login functionality

kontor-api-go/pkg/utils/auth.go

@@ -0,0 +1,8 @@
+package utils
+
+import "golang.org/x/crypto/bcrypt"
+
+func ComparePassword(hashedPassword, password string) bool {
+	err := bcrypt.CompareHashAndPassword([]byte(hashedPassword), []byte(password))
+	return err == nil
+}