Add 'Best Practices' section for Addon devs

[luzpaz]

• [ ] How to structure addons
  • [ ] Avoid name clashes w/ FC core or other addons (https://github.com/FredsFactory/FreeCAD_AirPlaneDesign/issues/36#issuecomment-1409218327)
  • [ ] Recommended linting practices
  • [ ] Recommended UI/UX practices
• [ ] How to create SVG icons (remove inkscape 'sodipop' metadata)
• [ ] How to create experimental branches and orient their testers to take advantage of the Addon Manager feature that allows installing said branches for testing in FC (https://github.com/jaheyns/CfdOF/pull/76#issuecomment-1513886711)
• [ ] How to try to limit 3rd party dependencies when available
• [ ] How to translate addons
  • [ ] How to add their translations to crowdin

[sliptonic]

Nice! This should be a sub-page under the technical guide

[luzpaz]

Created discussion and asking for feedback

• https://github.com/FreeCAD/FreeCAD/discussions/17595