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

hardware/README.md

@@ -1,3 +1,19 @@
 # /hardware
 
-Electrical design files including schematics, PCB layout, BOM, and simulations.
+Hardware documentation and support files for your KiCad project.
+
+## Purpose
+This directory contains hardware-related documentation and files that support your KiCad design:
+- Bill of Materials (BOM)
+- Component datasheets
+- Circuit simulations
+- Assembly documentation
+
+## Directory Structure
+- `bom/` - Bill of Materials in various formats
+- `datasheets/` - Component datasheets and specifications
+- `simulations/` - SPICE simulations and analysis
+- `assembly/` - Assembly drawings and instructions
+
+## Note
+Your main KiCad design files (`.kicad_pro`, `.kicad_sch`, `.kicad_pcb`) should be in the project root directory, with KiCad-specific files organized in the `/kicad/` directory.