docs: Add About REXPaint section to README

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Adds a new "About REXPaint" section to the README with information about the REXPaint ASCII art editor, including key features (multi-layer support, color editing, export formats) and platform availability (Windows, Wine on Linux/macOS). This provides helpful context for users unfamiliar with the REXPaint tool.

Trigger Events

Web UI: Please update the pyrexpaint readme with some more informati...

Promptless Research (1 webpage)

• Read webpage from gridsagegames.com

Agent Response

I've completed the documentation update. Here's a summary of what I did:

Summary

I added a new "About REXPaint" section to the pyrexpaint README that provides users with helpful context about the REXPaint ASCII art editor.

What was added:

About REXPaint - A concise overview including:

• Description: REXPaint as a free ASCII art editor from Grid Sage Games, commonly used for roguelike mockups, game UI layouts, and ANSI art
• Features - Key capabilities like multi-layer support, separate character/foreground/background editing, true-color picker, custom fonts and tilesets, and export formats (PNG, ANS, TXT, CSV, XML, .xp)
• Platform - Windows-only, with Wine support for Linux and macOS

Placement

The new section was added between the existing "Details" and "Installation" sections, providing helpful background context before users dive into installation and usage.

Style

I kept the content concise and minimal to match the existing README's casual, lightweight tone.

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A suggestion has been created for your review. The information was sourced from the official REXPaint website at gridsagegames.com.

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Citation: REXPaint features, use cases, and platform availability sourced from the official REXPaint website.
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