Add example Unity Project

Example Unity Project/Library/PackageCache/com.unity.timeline@1.2.18/Runtime/Attributes/TrackColorAttribute.cs

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+using System;
+using UnityEngine;
+
+namespace UnityEngine.Timeline
+{
+    /// <summary>
+    /// Attribute used to specify the color of the track and its clips inside the Timeline Editor.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class)]
+    public class TrackColorAttribute : Attribute
+    {
+        Color m_Color;
+
+        /// <summary>
+        ///
+        /// </summary>
+        public Color color
+        {
+            get { return m_Color; }
+        }
+
+        /// <summary>
+        /// Specify the track color using [0-1] R,G,B values.
+        /// </summary>
+        /// <param name="r">Red value [0-1].</param>
+        /// <param name="g">Green value [0-1].</param>
+        /// <param name="b">Blue value [0-1].</param>
+        public TrackColorAttribute(float r, float g, float b)
+        {
+            m_Color = new Color(r, g, b);
+        }
+    }
+}

Example Unity Project/Library/PackageCache/com.unity.timeline@1.2.18/Runtime/Attributes/TrackColorAttribute.cs.meta

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