[frogr] appdata: Add a <provides> rule pointing to the old frogr.desktop ID

[Mario Sanchez Prada <msanchez src gnome org>]

commit f37c15e86e8a50f40ef0ee44dd9c7c72f2cbf0d7
Author: Mario Sanchez Prada <msanchez gnome org>
Date:   Sun Jul 9 08:44:36 2017 +0100

    appdata: Add a <provides> rule pointing to the old frogr.desktop ID
    
    This will help GNOME Software to know that frogr and org.gnome.frogr
    are the same things, so that it can pull ratings and reviews created
    against the former ID. For more details, see this blog post:
    
    https://blogs.gnome.org/hughsie/2017/07/05/using-a-reverse-style-application-ids-in-your-application/

 data/org.gnome.frogr.appdata.xml.in |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/data/org.gnome.frogr.appdata.xml.in b/data/org.gnome.frogr.appdata.xml.in
index 5140c8d..3db2a67 100644
--- a/data/org.gnome.frogr.appdata.xml.in
+++ b/data/org.gnome.frogr.appdata.xml.in
@@ -25,6 +25,9 @@
       <caption>Screenshot of frogr</caption>
     </screenshot>
   </screenshots>
+  <provides>
+    <id>frogr.desktop</id>
+  </provides>
   <project_license>GPL-3.0</project_license>
   <project_group>GNOME</project_group>
   <developer_name>Mario Sanchez Prada</developer_name>