Add skill management system with unlocker and save functionality

resources/skills/brick_throw.tres

@@ -0,0 +1,15 @@
+[gd_resource type="Resource" script_class="SkillData" load_steps=3 format=3 uid="uid://dw5ee2lpeypnb"]
+
+[ext_resource type="PackedScene" uid="uid://coayig4dxelo2" path="res://objects/player_skills/brick_throw_skill.tscn" id="1_5gnea"]
+[ext_resource type="Script" path="res://scripts/resources/skill_data.gd" id="1_etxe2"]
+
+[resource]
+script = ExtResource("1_etxe2")
+name = "Brick power"
+description = "Allows you to throw bricks at enemies"
+node = ExtResource("1_5gnea")
+config = {
+"player_controller": NodePath("."),
+"timer": NodePath("ThrowTimer")
+}
+cost = 50