Added building structure

Created harvester building
added harvester particles
added nearest resource func

data/buildings/basic/harvester/harvester.gd

@@ -0,0 +1,20 @@
+extends Building
+
+const CARBON_RESOURCE = preload("res://data/game_resources/carbon/carbon_resource.tres")
+
+func ready(building: BuildingBase) -> void:
+	var nearest_res := Grid.get_nearest_resource(building.position, CARBON_RESOURCE)
+	var _distance = building.position.distance_to(nearest_res)
+	
+	var particles = CPUParticles2D.new()
+	particles.amount = 60
+	particles.spread = 8
+	particles.material = ParticleProcessMaterial.new()
+	particles.radial_accel_max = _distance * -2.5
+	particles.radial_accel_min = _distance * -2.55
+	particles.gravity = Vector2.ZERO
+	particles.direction = building.position.direction_to(nearest_res)
+	particles.initial_velocity_max = _distance * 2.25
+	particles.initial_velocity_min = _distance * 2.2
+	particles.lifetime = 1.65
+	building.add_child(particles)

data/buildings/basic/harvester/harvester_building.tres

@@ -0,0 +1,18 @@
+[gd_resource type="Resource" load_steps=5 format=3 uid="uid://d38xgwstvtcm4"]
+
+[ext_resource type="Texture2D" uid="uid://n806c03hgaq1" path="res://assets/scifi_tilesheet@2.png" id="1_m1sbx"]
+[ext_resource type="Script" path="res://data/buildings/basic/harvester/harvester.gd" id="3_fy2m4"]
+[ext_resource type="Resource" uid="uid://bpjj0x7jr1k6u" path="res://data/game_resources/carbon/carbon_resource.tres" id="3_xlnq5"]
+
+[sub_resource type="AtlasTexture" id="AtlasTexture_mgt0w"]
+atlas = ExtResource("1_m1sbx")
+region = Rect2(1088, 128, 64, 64)
+
+[resource]
+script = ExtResource("3_fy2m4")
+atlas_texture = SubResource("AtlasTexture_mgt0w")
+name = "Harvester"
+description = "Harvests nearby resources"
+cost = {
+ExtResource("3_xlnq5"): 100
+}