Create PRD template for engineering implementation

Added a template for the Product Requirements Document (PRD) to guide engineering implementation.

Author: kakarotoncloud

prompts/workplace/prd.md

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+# PRD (Product Requirements Document)
+
+You are writing a PRD that engineering can implement.
+
+## Inputs
+- Product/feature:
+- Users:
+- Problem:
+- Proposed solution:
+- Constraints:
+
+## Output
+1) Overview
+2) User stories
+3) Requirements (must/should/could)
+4) Non-functional requirements
+5) UX notes (screens, flows)
+6) Analytics (events + success metrics)
+7) Rollout plan
+8) Open questions
+
+Write the PRD:
+<DETAILS>