Feat/more additions

Assets/Samples/Farm/Scripts/Runtime/ParticleChanger.cs

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+namespace VRTK.Examples
+{
+    using Malimbe.PropertySerializationAttribute;
+    using Malimbe.XmlDocumentationAttribute;
+    using UnityEngine;
+
+    public class ParticleChanger : MonoBehaviour
+    {
+        /// <summary>
+        /// The <see cref="ParticleSystem"/> to control.
+        /// </summary>
+        [Serialized]
+        [field: DocumentedByXml]
+        public ParticleSystem Particles { get; set; }
+
+        public virtual void UpdateEmissionRate(float rate)
+        {
+            ParticleSystem.EmissionModule emissions = Particles.emission;
+            emissions.rateOverTime = rate;
+        }
+    }
+}