[seahorse] Properly update the README.

[Niels De Graef <nielsdg src gnome org>]

commit 3ae0d38c509260b9e91ab77063f269049ef16c8e
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Wed Nov 1 11:49:39 2017 +0100

    Properly update the README.
    
    Also start using Markdown-formatting.

 README    |   24 ------------------------
 README.md |   45 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+), 24 deletions(-)
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diff --git a/README.md b/README.md
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+# Seahorse
+Seahorse is a graphical interface for managing and using encryption keys.
+Currently it supports PGP keys (using GPG/GPGME) and SSH keys. Its goal is to
+provide an easy to use Key Management Tool, along with an easy to use interface
+for encryption operations.
+
+Seahorse is integrated into the GNOME Desktop Environment and allows users to
+perform operations from their regular applications, like nautilus or gedit.
+
+## Building
+You can build and install Seahorse by issuing the following commands:
+```sh
+./autogen.sh
+make
+make install
+```
+
+## Issue tracker
+Seahorse uses the GNOME Bugzilla, where you can check the
+[list of open bugs](https://bugzilla.gnome.org/browse.cgi?product=seahorse).
+
+If you'd like to report a bug in Seahorse or request an enhancement, please file
+an issue using the
+[appropriate form](https://bugzilla.gnome.org/enter_bug.cgi?product=seahorse).
+
+In case of a bug, please also add reproducible steps and the version of Seahorse.
+
+## Contributing
+If you would like to contribute a patch, you should send it in to the GNOME
+Bugzilla as well. If the patch fixes an existing bug, add the patch as an
+attachment to that bug report; otherwise, enter a new bug report that describes
+the patch, and attach the patch to that bug report.
+
+For more information on the recommended workflow, please read
+[this wiki page](https://wiki.gnome.org/Git/WorkingWithPatches).
+
+## More information
+Seahorse has its own web page on https://wiki.gnome.org/Apps/Seahorse.
+
+To discuss issues with developers and other users, you can subscribe to the
+[mailing list](https://mail.gnome.org/mailman/listinfo/seahorse-list)
+or join [#seahorse](irc://irc.gnome.org/seahorse) on irc.gnome.org.
+
+## License
+Seahorse is released under the GPL. See COPYING for more info.