[gtk: 2/5] appdata: Add content_rating

[Matthias Clasen <matthiasc src gnome org>]

commit a5e7b92c5d5c190729530c3fe06b88d7d86c8214
Author: Maximiliano Sandoval R <msandova protonmail com>
Date:   Fri Jul 16 10:41:40 2021 +0200

    appdata: Add content_rating
    
    https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html#tag-content_rating

 demos/gtk-demo/org.gtk.Demo4.appdata.xml.in                | 1 +
 demos/icon-browser/org.gtk.IconBrowser4.appdata.xml.in     | 1 +
 demos/print-editor/org.gtk.PrintEditor4.appdata.xml        | 1 +
 demos/widget-factory/org.gtk.WidgetFactory4.appdata.xml.in | 1 +
 4 files changed, 4 insertions(+)
---
diff --git a/demos/gtk-demo/org.gtk.Demo4.appdata.xml.in b/demos/gtk-demo/org.gtk.Demo4.appdata.xml.in
index 844f575a45..2697ea0f0d 100644
--- a/demos/gtk-demo/org.gtk.Demo4.appdata.xml.in
+++ b/demos/gtk-demo/org.gtk.Demo4.appdata.xml.in
@@ -30,6 +30,7 @@
   <translation type="gettext">gtk-4.0</translation>
   <update_contact>matthias.clasen_at_gmail.com</update_contact>
   <developer_name>Matthias Clasen and others</developer_name>
+  <content_rating type="oars-1.1"/>
   <releases>
     <release version="@BUILD_VERSION@" date="@BUILD_DATE@">
       <description>
diff --git a/demos/icon-browser/org.gtk.IconBrowser4.appdata.xml.in 
b/demos/icon-browser/org.gtk.IconBrowser4.appdata.xml.in
index 307b01a4ce..f08e9d1ba7 100644
--- a/demos/icon-browser/org.gtk.IconBrowser4.appdata.xml.in
+++ b/demos/icon-browser/org.gtk.IconBrowser4.appdata.xml.in
@@ -29,6 +29,7 @@
   <translation type="gettext">gtk-4.0</translation>
   <update_contact>matthias.clasen_at_gmail.com</update_contact>
   <developer_name>Matthias Clasen and others</developer_name>
+  <content_rating type="oars-1.1"/>
   <releases>
     <release version="@BUILD_VERSION@" date="@BUILD_DATE@">
       <description>
diff --git a/demos/print-editor/org.gtk.PrintEditor4.appdata.xml 
b/demos/print-editor/org.gtk.PrintEditor4.appdata.xml
index 3e92a2bfd5..149bf3e93d 100644
--- a/demos/print-editor/org.gtk.PrintEditor4.appdata.xml
+++ b/demos/print-editor/org.gtk.PrintEditor4.appdata.xml
@@ -24,6 +24,7 @@
   <translation type="gettext">gtk-4.0</translation>
   <update_contact>matthias.clasen_at_gmail.com</update_contact>
   <developer_name>Matthias Clasen and others</developer_name>
+  <content_rating type="oars-1.1"/>
   <releases>
     <release version="3.99.0" date="2020-07-30">
       <description>
diff --git a/demos/widget-factory/org.gtk.WidgetFactory4.appdata.xml.in 
b/demos/widget-factory/org.gtk.WidgetFactory4.appdata.xml.in
index a1aa5537a9..174d80053d 100644
--- a/demos/widget-factory/org.gtk.WidgetFactory4.appdata.xml.in
+++ b/demos/widget-factory/org.gtk.WidgetFactory4.appdata.xml.in
@@ -31,6 +31,7 @@
   <translation type="gettext">gtk-4.0</translation>
   <update_contact>matthias.clasen_at_gmail.com</update_contact>
   <developer_name>Matthias Clasen and others</developer_name>
+  <content_rating type="oars-1.1"/>
   <releases>
     <release version="@BUILD_VERSION@" date="@BUILD_DATE@">
       <description>