feat: add prompts for generating Mermaid diagrams for Flutter application architecture and use cases

docs/prompts/create-mermaid-overview-flutter.md

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+## What the prompt does
+This prompt generates a Mermaid diagram that provides an overview of the given Flutter application's architecture. It includes the main components of the app, such as the widget tree, state management, and navigation.
+
+## Assumptions
+- Flutter project is given.
+
+## Prompt
+In the given Flutter project. Carefully analyze all files to understand the app’s navigation, logic flow, state management, and how each screen connects to the next.
+
+Using that analysis, generate a **Mermaid flowchart** that shows:
+
+* The app’s entry point (main.dart → root widget).
+* The initial flow (e.g., splash → login/signup → authenticated home).
+* All pages/screens and how navigation occurs between them.
+* Conditional routing logic (authentication checks, API responses, state changes, etc.).
+* Any loops, flows, or background logic that impact navigation.
+* The diagram must accurately reflect the project structure and not make assumptions beyond what is found in the code.
+
+Use **Mermaid `flowchart TD` or `flowchart LR`** format, with clear labels for each screen and logic decision.
+
+If needed, ask me for missing files so you can produce a complete diagram.