Add/update READMEs

hpath-directory/README.md

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+# HPath-filepath
+
+[![Gitter chat](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/hasufell/hpath?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![Hackage version](https://img.shields.io/hackage/v/hpath-directory.svg?label=Hackage)](https://hackage.haskell.org/package/hpath-directory) [![Build Status](https://api.travis-ci.org/hasufell/hpath.png?branch=master)](http://travis-ci.org/hasufell/hpath) [![Hackage-Deps](https://img.shields.io/hackage-deps/v/hpath-directory.svg)](http://packdeps.haskellers.com/feed?needle=hpath-directory)
+
+Support high-level IO operations on files/directories, utilizing ByteString
+as FilePaths.
+
+This package is part of the HPath suite, also check out:
+
+* [hpath](https://hackage.haskell.org/package/hpath)
+* [hpath-filepath](https://hackage.haskell.org/package/hpath-filepath)
+* [hpath-io](https://hackage.haskell.org/package/hpath-io)
+
+## Motivation
+
+This is basically a fork of [directory](https://hackage.haskell.org/package/directory), but is a complete rewrite and the API doesn't follow the directory package.
+
+## Differences to 'posix-paths'
+
+* has a custom versions of `openFd` which allows more control over the flags than its unix package counterpart
+* adds a `getDirectoryContents'` version that works on Fd