Testably.Abstractions.FileSystem.Interface 0.2.0-pre.1

This library contains the abstraction interfaces for Testably.Abstractions, which allow replacing system dependencies:

• The IFileSystem interface abstracts away all I/O-related functionality from the System.IO namespace:
  Static methods are directly implemented on the IFileSystem interface. Constructors are implemented as factory methods, e.g. IFileSystem.FileInfo.New(string) instead of new FileInfo(string).
• The ITimeSystem interface abstracts away time-related functionality:
  DateTime methods give access to the current time, Thread allows replacing Thread.Sleep and Task allows replacing Task.Delay.
• The IRandomSystem interface abstracts away functionality related to randomness:
  Random methods implement a thread-safe Shared instance also under .NET Framework and Guid methods allow creating new GUIDs.