Update related_resources.md with PM Prompts for Gen AI

[deanpeters]

• Adding the library Product Manager Prompts for Generative AI
• Product Manager Prompts for Generative AI:

Summary

Open-source prompts built on well-known, often-practiced product manager tools, techniques, and templates.

Examples written in Markdown that include Osterwalder Value Proposition Canvas, Jeff Patton User Story Mapping, Teresa Torres Opportunity Solution Tree, and User Story generation based on the Mike Cohn Use Case format adorned by a Gherkin-style acceptance criteria.

Also included are some 'prompt generators' that generate prompts for product managers looking to start sessions, perform market research, or explore jobs-to-be-done.

Motivation

Help create great conversations around well-known, well-used product management canvases, templates, tools, and techniques without having to memorize things like "the 5 parts of the Jeff Patton user story map" or "the value proposition vs. differentiation parts of a Geoffrey Moore-style positioning statement."

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