Add README for issues documentation directory

Author: Copilot

docs/issues/README.md

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+# Issue Documentation
+
+This directory contains detailed documentation for resolved issues in the Railway Interlocking Simulator project.
+
+## Issue #80: GUI InOut Validation
+
+**Status:** ✅ Implemented (2026-02-06)
+
+**Files:**
+- `issue-80-final-summary.md` - Executive summary and overview
+- `issue-80-implementation.md` - Complete implementation guide
+- `issue-80-flow-diagram.md` - Visual flow diagrams and validation logic
+- `issue-80-visual-mockup.txt` - UI mockup and user interaction scenarios
+
+**Summary:**
+Implemented GUI validation to prevent saving railway networks with insufficient InOut elements (minimum 2 required). Provides immediate, user-friendly feedback at save time with clear error messages and actionable guidance.
+
+**Key Features:**
+- Pre-save validation in MenuBar.performSave()
+- User-friendly error dialog with current count
+- Blocks save operation when validation fails
+- 100% test coverage (5 test cases)
+- Comprehensive documentation (4 files, 33KB)
+
+**Related:**
+- Issue #80: This implementation
+- PR #76: XML validation
+- Issue #29: Validation requirements
+- Issue #258: Future comprehensive validation framework
+
+---
+
+## Documentation Structure
+
+Each issue documentation typically includes:
+
+1. **Summary File** - Executive overview with statistics
+2. **Implementation File** - Detailed technical implementation
+3. **Flow Diagram File** - Visual representations and logic flow
+4. **Mockup/Demo File** - UI mockups or usage examples
+
+## Contributing
+
+When documenting issues:
+- Create a dedicated file for each major aspect
+- Include visual diagrams where helpful
+- Document design decisions and rationale
+- Add test coverage information
+- Link related issues and PRs
+
+## Format
+
+Use Markdown (.md) for structured documentation.
+Use plain text (.txt) for ASCII art diagrams and mockups.
+
+---
+
+**Last Updated:** 2026-02-06