添加对 Core 的直接引用

RhythmBaseCore/Components/Easing/EasePropertyAttribute.cs

@@ -0,0 +1,10 @@
+namespace RhythmBase.Components.Easing
+{
+	/// <summary>
+	/// An attribute to mark properties for easing functions.
+	/// </summary>
+	[AttributeUsage(AttributeTargets.Property)]
+	public class EasePropertyAttribute : Attribute
+	{
+	}
+}