Added a simple README.md file

Win32-network/README.md

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+# Asynchronious IO for Windows
+
+`Win32-network` provides low level api for doing IO / networking on Windows
+using Overlapped (or asynchronous) IO.  It supports:
+
+* `File` Api
+* `NamedPipes` Api
+* `winsock2` - Berkeley sockets api on Windows
+
+`NamedPipes` provide a good alternative for the lack of Unix Sockets on
+Windows, and there are ways of providing abstraction for both, though this is
+not present in this package.
+
+An application which is using this package should use `-threaded` option, as
+the io manager thread runs a blocking ffi call (e.g.
+[GetQueuedCompletionStatus](https://docs.microsoft.com/en-us/windows/win32/api/ioapiset/nf-ioapiset-getqueuedcompletionstatus)).