[gnome-books] README: Convert to MarkDown and add info

[Bastien Nocera <hadess src gnome org>]

commit 27d6f09e4a97a10dccd7a61f271863e42031c6a1
Author: Roger <sachanroger gmail com>
Date:   Sat Aug 24 22:14:27 2019 +0000

    README: Convert to MarkDown and add info

 README    |  2 --
 README.md | 15 +++++++++++++++
 2 files changed, 15 insertions(+), 2 deletions(-)
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diff --git a/README.md b/README.md
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+# GNOME Books
+
+Books is an e-book manager application for GNOME.
+
+<a href='https://flathub.org/apps/details/org.gnome.Books'><img width='240' alt='Download on Flathub' 
src='https://flathub.org/assets/badges/flathub-badge-i-en.png'/></a>
+
+## Useful links
+
+- Homepage: https://wiki.gnome.org/Apps/Books
+
+- Report issues: https://gitlab.gnome.org/GNOME/gnome-books/issues/
+
+- Donate: https://www.gnome.org/friends/
+
+- Translate: https://wiki.gnome.org/TranslationProject
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