Add ReadKey to IConsole (#111)

Co-authored-by: Alexey Golub <tyrrrrrr@gmail.com>

CliFx/Infrastructure/FakeConsole.cs

@@ -90,6 +90,11 @@ namespace CliFx.Infrastructure
         {
         }
 
+        /// <inheritdoc />
+        public void ReadKey(bool intercept = false)
+        {
+        }
+
         /// <inheritdoc />
         public virtual void Dispose() => _cancellationTokenSource.Dispose();
     }

CliFx/Infrastructure/IConsole.cs

@@ -87,6 +87,11 @@ namespace CliFx.Infrastructure
         /// Clears the console buffer and corresponding console window of display information.
         /// </summary>
         void Clear();
+
+        /// <summary>
+        /// Obtains the next character or function key pressed by the user.
+        /// </summary>
+        void ReadKey(bool intercept = false);
     }
 
     /// <summary>

CliFx/Infrastructure/SystemConsole.cs

@@ -93,6 +93,9 @@ namespace CliFx.Infrastructure
         /// <inheritdoc />
         public void Clear() => Console.Clear();
 
+        /// <inheritdoc />
+        public void ReadKey(bool intercept = false) => Console.ReadKey(intercept);
+
         /// <inheritdoc />
         public void Dispose()
         {