Add project files.

AssetStudio/Progress.cs

@@ -0,0 +1,30 @@
+using System;
+namespace AssetStudio
+{
+    public static class Progress
+    {
+        public static IProgress<int> Default = new Progress<int>();
+        private static int preValue;
+
+        public static void Reset()
+        {
+            preValue = 0;
+            Default.Report(0);
+        }
+
+        public static void Report(int current, int total)
+        {
+            var value = (int)(current * 100f / total);
+            Report(value);
+        }
+
+        private static void Report(int value)
+        {
+            if (value > preValue)
+            {
+                preValue = value;
+                Default.Report(value);
+            }
+        }
+    }
+}