Provide Console.readKey

Currently, `Console` does not provide a way to read key synchronously. Something similar to C#'s [Console.ReadKey](https://msdn.microsoft.com/en-us/library/471w8d85%28v=vs.110%29.aspx) will be helpful. 

`Keyboard` class provides only asynchronous way to read keys, and `ConsoleAdapter.readByte` method does not handle escape sequences.
