Refine repository structure for KiCad 9 optimization

- Add dedicated /kicad/ directory with organized subdirectories for libraries, schematics, gerbers, plots, and backups
- Create comprehensive KiCad 9 library structure (symbols, footprints, 3D models)
- Add manufacturing-ready directories for production files (gerbers, drill, pick-and-place)
- Update all README files with KiCad-specific documentation and workflows
- Add KiCad-optimized .gitignore file for proper version control
- Create KICAD-PROJECT-TEMPLATE.md comprehensive usage guide
- Add hardware assembly documentation and BOM management
- Include detailed manufacturing file generation instructions
- Add docs structure with design-notes and user-manual directories
- Provide complete workflow from design to manufacturing with quality checklists

docs/user-manual/README.md

@@ -0,0 +1,134 @@
+# /docs/user-manual
+
+End-user documentation and guides for your KiCad project.
+
+## Purpose
+This directory contains documentation for the end users of your finished product, including operation manuals, setup guides, and troubleshooting information.
+
+## Document Types
+- **User Manual**: Complete operating instructions
+- **Quick Start Guide**: Getting started quickly
+- **Installation Guide**: Setup and installation procedures
+- **Troubleshooting Guide**: Common problems and solutions
+- **Safety Information**: Important safety warnings
+- **Specifications**: Technical specifications for users
+- **FAQ**: Frequently asked questions
+
+## Recommended Files
+```
+user-manual/
+├── user-manual.md               # Complete user manual
+├── quick-start.md               # Quick start guide
+├── installation.md              # Installation instructions
+├── operation.md                 # Operating procedures
+├── troubleshooting.md           # Problem solving guide
+├── specifications.md            # Technical specifications
+├── safety.md                    # Safety information
+├── faq.md                       # Frequently asked questions
+├── warranty.md                  # Warranty information
+└── images/                      # User manual images
+    ├── setup-diagram.png
+    ├── connection-diagram.png
+    ├── led-indicators.jpg
+    └── troubleshooting-flowchart.png
+```
+
+## User Manual Structure
+### Suggested Sections
+1. **Introduction**
+   - Product overview
+   - Key features
+   - What's included in the box
+
+2. **Safety Information**
+   - Important warnings
+   - Precautions
+   - Regulatory compliance
+
+3. **Installation/Setup**
+   - Unpacking instructions
+   - Connection procedures
+   - Initial configuration
+
+4. **Operation**
+   - Basic operation
+   - Advanced features
+   - User interface guide
+
+5. **Troubleshooting**
+   - Common problems
+   - Error codes/indicators
+   - Solutions and fixes
+
+6. **Specifications**
+   - Technical specifications
+   - Environmental conditions
+   - Compliance information
+
+7. **Maintenance**
+   - Routine maintenance
+   - Cleaning procedures
+   - Storage recommendations
+
+8. **Support**
+   - Contact information
+   - Warranty details
+   - Additional resources
+
+## Quick Start Guide
+Create a concise guide for immediate use:
+- **Unboxing**: What's in the package
+- **Connections**: Essential connections only
+- **Power On**: First power-up procedure
+- **Basic Test**: Simple functionality test
+- **Next Steps**: Reference to full manual
+
+## Installation Guide
+Detailed setup instructions:
+- **Prerequisites**: Required tools and materials
+- **Environment**: Installation environment requirements
+- **Step-by-Step**: Detailed installation procedure
+- **Verification**: How to verify correct installation
+- **Configuration**: Initial setup and configuration
+
+## Troubleshooting Guide
+Help users solve problems:
+- **Symptom-Based**: Organize by what user observes
+- **LED Indicators**: What different lights mean
+- **Error Codes**: Explanation of error messages
+- **Common Issues**: Most frequent problems
+- **Advanced Diagnostics**: For technical users
+- **When to Contact Support**: Escalation criteria
+
+## Safety Information
+Critical safety content:
+- **Warnings**: Serious hazards that could cause injury
+- **Cautions**: Situations that could damage equipment
+- **Notes**: Important information for proper operation
+- **Regulatory**: Compliance statements and certifications
+- **Disposal**: Proper disposal and recycling information
+
+## Writing Guidelines
+- **User-Focused**: Write from user's perspective
+- **Clear Language**: Avoid technical jargon
+- **Step-by-Step**: Break complex procedures into steps
+- **Visual Aids**: Include diagrams and photos
+- **Consistent Terminology**: Use same terms throughout
+- **Test Instructions**: Verify all procedures work
+- **Version Control**: Keep documentation current with product
+
+## Images and Diagrams
+Include helpful visuals:
+- **Connection diagrams**: How to connect cables
+- **LED status indicators**: What lights mean
+- **User interface**: Screenshots or photos of displays
+- **Physical installation**: Mounting and positioning
+- **Troubleshooting flowcharts**: Decision trees for problems
+
+## Localization Considerations
+If supporting multiple languages:
+- **Text Translation**: Professional translation services
+- **Cultural Adaptation**: Local customs and preferences
+- **Units**: Metric vs imperial measurements
+- **Regulatory**: Local compliance requirements
+- **Support**: Local support contact information