Submission: Add Taskade (AI-native workspace platform)

[johnxie]

Submission: Taskade

Hi maintainers, I'd like to submit Taskade for this list.

• Repo: https://github.com/taskade/taskade
• Website: https://taskade.com
• One-line description: AI-native workspace platform to build apps, deploy AI agents, and automate workflows from one prompt.

Suggested entry

- [Taskade](https://github.com/taskade/taskade) - AI-native workspace platform to build apps, deploy AI agents, and automate workflows from one prompt.

If this repo prefers a different section or format, I'm happy to open a follow-up PR in your preferred style.