Add project files.

PluginManager/Items/CustomProgressBar.cs

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+using System;
+namespace PluginManager.Items
+{
+    public class CustomProgressBar
+    {
+        private const char _block = '#';
+        private const char _emptyBlock = ' ';
+        private const char _leftMargin = '[';
+        private const char _rightMargin = ']';
+
+        const string _back = "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b";
+        public static void WriteProgressBar(int percent)
+        {
+            Console.Write(_back);
+            Console.Write(_leftMargin);
+            var p = (int)((percent / 10f) + .5f);
+            for (var i = 0; i < 10; ++i)
+            {
+                if (i >= p)
+                    Console.Write(_emptyBlock);
+                else
+                    Console.Write(_block);
+            }
+            Console.Write($"{_rightMargin} " + percent + " %");
+        }
+    }
+}

PluginManager/Items/Spinner.cs

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+using System;
+using System.Threading.Tasks;
+
+namespace PluginManager.Items
+{
+    public class Spinner
+    {
+        public bool isSpinning;
+
+        public Spinner()
+        {
+            isSpinning = false;
+        }
+
+        public async void Start()
+        {
+            isSpinning = true;
+            int cnt = 0;
+
+            while (isSpinning)
+            {
+                cnt++;
+                switch (cnt % 4)
+                {
+                    case 0: Console.Write("/"); break;
+                    case 1: Console.Write("-"); break;
+                    case 2: Console.Write("\\"); break;
+                    case 3: Console.Write("|"); break;
+                }
+                Console.SetCursorPosition(Console.CursorLeft - 1, Console.CursorTop);
+                await Task.Delay(500);
+            }
+        }
+
+        public void Stop()
+        {
+            isSpinning = false;
+        }
+    }
+}