Added building structure

Created harvester building
added harvester particles
added nearest resource func

data/buildings/building_base.gd

@@ -8,6 +8,7 @@ var _building_data: Building
 func initialize(data: Building, grid_location: Vector2i) -> void:
 	_building_data = data
 	position = Grid.grid_to_world_center(grid_location)
+	_building_data.ready(self)
 
 func _ready() -> void:
 	sprite_2d.texture = _building_data.atlas_texture