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

.gitignore

@@ -0,0 +1,114 @@
+# KiCad 9 Project Template .gitignore
+
+# KiCad Backup Files
+*.kicad_pcb-bak
+*.kicad_sch-bak
+*.kicad_pro-bak
+*-backups/
+kicad/backups/
+
+# KiCad Auto-save Files
+*-save.kicad_pcb
+*-save.kicad_sch
+*-save.pro
+\#auto_saved_files\#
+
+# KiCad Temporary Files
+*.tmp
+*~
+*.swp
+*.swo
+
+# KiCad Cache Files
+*-cache.lib
+*-rescue.lib
+*-rescue.dcm
+fp-info-cache
+
+# KiCad Generated Files (optional - uncomment if you don't want to track these)
+# *.gbr
+# *.drl
+# *.csv
+# *.pdf
+# *.ps
+# *.svg
+
+# OS Generated Files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+desktop.ini
+
+# IDE and Editor Files
+.vscode/
+.idea/
+*.sublime-*
+*~
+
+# Python (for KiCad scripts)
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+env/
+venv/
+.env
+
+# Node.js (for web-based tools)
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Build and Distribution
+build/
+dist/
+*.egg-info/
+
+# Documentation Build
+docs/_build/
+site/
+
+# Logs
+*.log
+logs/
+
+# Temporary directories
+tmp/
+temp/
+
+# Archive files
+*.zip
+*.tar.gz
+*.rar
+*.7z
+
+# Simulation files (large SPICE outputs)
+*.raw
+*.ac0
+*.tr0
+*.sw0
+
+# Manufacturing files (uncomment if you want to exclude from repo)
+# manufacturing/gerbers/*.gbr
+# manufacturing/drill/*.drl
+# manufacturing/pick-and-place/*.csv
+
+# Large binary files
+*.step
+*.stp
+*.iges
+*.igs
+*.stl
+
+# Exclude large 3D models (uncomment if models are too large)
+# kicad/libraries/3dmodels/*.step
+# kicad/libraries/3dmodels/*.wrl
+
+# Project-specific ignores (customize as needed)
+# Add your project-specific files to ignore here