Decouple ParticleSimulation into separate class

ParticleSimulation/Particle.cs

@@ -0,0 +1,33 @@
+using Godot;
+
+namespace Particles
+{
+    public class Particle
+    {
+
+        public Vector2 Position = new Vector2();
+        public Vector2 Velocity = new Vector2();
+        public ParticleType Type { get; }
+        public float AverageSpeed { get; private set; } = 1f;
+
+        public int Id { get; }
+        public float Health
+        {
+            get => _health;
+            set => _health = Mathf.Clamp(value, 0f, 1f);
+        }
+
+        private float _health = 1f;
+
+        public Particle(int id, ParticleType type)
+        {
+            Id = id;
+            Type = type;
+        }
+        
+        public void AddAverageSpeedValue(float speed)
+        {
+            AverageSpeed = (0.99f * AverageSpeed) + (0.01f * speed);
+        }
+    }
+}