[polari] appdata: Add join dialog screenshot

[Florian Müllner <fmuellner src gnome org>]

commit 44a3469249b8ad7b6a0579cc2d0a9e1f0dfcb61b
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Mar 14 01:56:11 2017 +0100

    appdata: Add join dialog screenshot
    
    ... to show off the shiny new room list.

 data/appdata/org.gnome.Polari.appdata.xml.in |    3 +++
 data/appdata/polari-join-dialog.png          |  Bin 0 -> 110894 bytes
 2 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/data/appdata/org.gnome.Polari.appdata.xml.in b/data/appdata/org.gnome.Polari.appdata.xml.in
index eb820fe..3841bc2 100644
--- a/data/appdata/org.gnome.Polari.appdata.xml.in
+++ b/data/appdata/org.gnome.Polari.appdata.xml.in
@@ -28,6 +28,9 @@
       <image>https://git.gnome.org/browse/polari/plain/data/appdata/polari-user-list.png</image>
     </screenshot>
     <screenshot>
+      <image>https://git.gnome.org/browse/polari/plain/data/appdata/polari-join-dialog.png</image>
+    </screenshot>
+    <screenshot>
       <image>https://git.gnome.org/browse/polari/plain/data/appdata/polari-connection.png</image>
     </screenshot>
     <screenshot>
diff --git a/data/appdata/polari-join-dialog.png b/data/appdata/polari-join-dialog.png
new file mode 100644
index 0000000..9b2cdad
Binary files /dev/null and b/data/appdata/polari-join-dialog.png differ