Add project files.

Assets/Cryville/Common/Unity/UI/ProgressBar.cs

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+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Cryville.Common.Unity.UI {
+	public class ProgressBar : Slider {
+		[SerializeField][Range(0f, 1f)]
+		float m_smooth = 0;
+		public float Smooth {
+			get { return m_smooth; }
+			set { m_smooth = value; }
+		}
+
+		[SerializeField]
+		float m_targetValue;
+		public override float value {
+			get { return base.value; }
+			set { m_targetValue = value; }
+		}
+
+#pragma warning disable IDE0051
+		protected override void Update() {
+			base.value = (base.value - m_targetValue) * m_smooth + m_targetValue;
+			base.Update();
+		}
+#pragma warning restore IDE0051
+	}
+}