first working server

pkg/errors/errors.go

@@ -3,8 +3,7 @@ package errors
 import "errors"
 
 var (
-    ErrUserNotFound = errors.New("user not found")
-    ErrInvalidEmail = errors.New("invalid email")
-    // Add other custom errors here
+	ErrUserNotFound       = errors.New("user not found")
+	ErrInvalidEmail       = errors.New("invalid email")
+	ErrInvalidCredentials = errors.New("invalid credentials: unauthorized")
 )
-