add tokyo-day theme & add contributor (README.md)

[tranthaituananh]

All Submissions

• [x] Have you followed the guidelines in our Contributing document?
• [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions

1. [x] Does your submission pass tests?
2. [x] Have you lint your code locally prior to submission?

Changes to Core Features

• [x] Have you added an explanation of what your changes do and why you'd like us to include them?
• [x] Have you written new tests for your core changes, as applicable?
• [x] Have you successfully ran tests with your changes locally?

[tranthaituananh]

I removed it from README.md

[Ashutosh00710]

Thank You for the contribution @tranthaituananh 🚀