Adding success toast on successful creation of shortened url

[github-actions[bot]]

Congratulations, @Nehakumari1208! 🎉 Thank you for creating your issue. Your contribution is greatly appreciated and we look forward to working with you to resolve the issue. Keep up the great work!

We will promptly review your changes and offer feedback. Keep up the excellent work! Kindly remember to check our contributing guidelines

[abhijeetnishal]

Hey @Nehakumari1208, we are already showing toast for error and limits we don't need for success. Contribute to other issues or project, good luck.