add vfx graph package

add vfx graph learning templates
add vfx arc example

Simulation/Assets/Scripts/ModifyParticleSystem.cs

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+using System;
+using UnityEngine;
+
+namespace DefaultNamespace
+{
+    public class ModifyParticleSystem : MonoBehaviour
+    {
+            [SerializeField] private ParticleSystem particleSystem;
+            [SerializeField] private Transform[] objects;
+
+
+            private ParticleSystem.Particle[] _particles = new ParticleSystem.Particle[1000]; // is a buffer
+
+            private void Awake()
+            {
+                // particleSystem.Emit();
+
+                // ParticleSystem.MainModule main = particleSystem.main;
+                // main.startSpeed = 10;
+            }
+
+            private void Update()
+            {
+                int activeParticles = particleSystem.GetParticles(_particles);
+                for (int i = 0; i < activeParticles; i++)
+                {
+                    // use or change particles
+
+                    // _particles[i].velocity *= 1.1f;
+                    // objects[i].position = _particles[i].position;
+                }
+
+                // set particles
+                particleSystem.SetParticles(_particles, activeParticles);
+            }
+    }
+}

Simulation/Assets/Scripts/ModifyParticleSystem.cs.meta

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+fileFormatVersion: 2
+guid: 124fae8104fd4b9c9ca9f0b4b95b7ce4
+timeCreated: 1765477206