[postr] Update content of README.md

[Germán Poo-Caamaño <gpoo src gnome org>]

commit a515a1824456571f4f54525afca9852f766dcfbb
Author: Germán Poo-Caamaño <gpoo gnome org>
Date:   Wed May 30 10:34:01 2018 -0400

    Update content of README.md

 README.md | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)
---
diff --git a/README.md b/README.md
index cabb7e6..0f5c836 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,18 @@
-Flickr Uploader
-aka Postr
+# ![postr-logo] Postr
 
-Copyright (C) 2006-2008 Ross Burton <ross burtonini com>
-Copyright (C) 2009-2012 Germán Poo-Caamaño <gpoo gnome org>
+Postr is a [Flickr][1] uploading tool for GNOME, which aims to be simple to
+use but exposing enough of Flickr to be useful. 
+
+## Features
+
+* Simple user interface.
+* Set the common attributes for your photos: title, description, tags, sets, groups, privacy, licence, etc.
+* Nautilus integration: Either run postr when you are browsing your photos or just would to drag from 
Nautilus to drop them in Postr.
+* Session management: If you ran out of time, you may save your session and continue working on it later. 
+
+## Postr Requirements
 
 Postr requires PyGObject and GTK+3.
+
+[postr-logo]: 
+[1]: https://flickr.com/