13 mower manuals added

13 more lawn mower manuals and parts lists were added recently, for the following brands:

- Black & Decker: 2 mower manuals, 3 mower parts lists
- Gardenline: 1 mower manual
- Greenworks: 2 mower manuals
- Husqvarna: 2 mower parts lists
- Kingcat: 3 mower parts lists