btrfs-progs: add an initial README

Signed-off-by: David Sterba <dsterba@suse.com>

README.md

@@ -0,0 +1,41 @@
+Btrfs-progs
+===========
+
+Userspace utilities to manage btrfs filesystems.
+License: GPLv2.
+
+Btrfs is a copy on write (COW) filesystem for Linux aimed at implementing
+advanced features while focusing on fault tolerance, repair and easy
+administration.
+
+
+This repository hosts following utilities:
+
+* **btrfs** — the main administration tool ([manual page](https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs))
+* **mkfs.btrfs** — utility to create the filesystem ([manual page](https://btrfs.wiki.kernel.org/index.php/Manpage/mkfs.btrfs))
+
+See INSTALL for build instructions.
+
+Release cycle
+-------------
+
+The major version releases are time-based and follow the cycle of the linux
+kernel releases. The cycle usually takes 2 months. A minor version releases may
+happen in the meantime if there are queued bug fixes or minor useful
+improvements.
+
+Development
+-----------
+
+The patch submissions, development or general discussions take place at
+*linux-btrfs@vger.kernel.org* mailinglist, subsciption not required.
+
+References
+----------
+
+* [Wiki with more information](https://btrfs.wiki.kernel.org)
+* [Btrfs-progs changelogs](https://btrfs.wiki.kernel.org/index.php/Changelog#By_version_.28btrfs-progs.29)
+* [wiki/FAQ](https://btrfs.wiki.kernel.org/index.php/FAQ)
+* [wiki/Getting started](https://btrfs.wiki.kernel.org/index.php/Getting_started)
+* [wiki/TODO](https://btrfs.wiki.kernel.org/index.php/Project_ideas#Userspace_tools_projects)
+* [wiki/Developer's FAQ](https://btrfs.wiki.kernel.org/index.php/Developer's_FAQ)