[gnome-builder] Add required description field in appdata

[Günther Wagner <gwagner src gnome org>]

commit b77ae18074f03938c59fcfb80e347c51c6a005a3
Author: Yotam Nachum <me yotam net>
Date:   Fri Nov 5 17:51:20 2021 +0200

    Add required description field in appdata
    
    The application won't compile without a non empty description

 src/plugins/meson-templates/resources/data/hello.appdata.xml.in | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/plugins/meson-templates/resources/data/hello.appdata.xml.in 
b/src/plugins/meson-templates/resources/data/hello.appdata.xml.in
index b1c11abff..a660e9fbb 100644
--- a/src/plugins/meson-templates/resources/data/hello.appdata.xml.in
+++ b/src/plugins/meson-templates/resources/data/hello.appdata.xml.in
@@ -4,5 +4,6 @@
        <metadata_license>CC0-1.0</metadata_license>
        <project_license>{{project_license}}</project_license>
        <description>
+         <p>No description</p>
        </description>
 </component>