Implement System.IO.FileSystem

**Implementation**
- [x] [DirectoryInfo ](https://docs.microsoft.com/en-us/dotnet/api/system.io.directoryinfo?view=netframework-4.8)
- [x] [FileInfo ](https://docs.microsoft.com/en-us/dotnet/api/system.io.fileinfo?view=netframework-4.8)
**Examples**
 - [ ] add simple example
**Documentation**
 - [ ] add simple documentation