Add MIT license to AppImageHub metadata

- Add X-AppImage-Payload-License=MIT to desktop file [AppImageHub] section
- Add license: MIT and description to apps/Aquiis.md YAML frontmatter
- Fixes AppImageHub CI validation 'No license found' error

Author: CIS Guru

apps/Aquiis.md

@@ -2,6 +2,9 @@
 layout: app
 permalink: /Aquiis/
 
+description: Multi-tenant property management system for DIY landlords
+license: MIT
+
 icons:
   - Aquiis/aquiis.png
 
@@ -31,6 +34,7 @@ desktop:
     Categories: Office;Finance
     Comment: Multi-tenant property management system for DIY landlords
   AppImageHub:
+    X-AppImage-Payload-License: MIT
     X-AppImage-Type: 2
     X-AppImage-Architecture: x86_64
 ---

database/Aquiis/aquiis.desktop

@@ -11,3 +11,12 @@ X-AppImage-Version=1.1.1
 X-AppImage-Name=Aquiis Property Management
 X-AppImage-Arch=x86_64
 Keywords=property;management;landlord;rental;lease;tenant;invoice;
+
+[AppImageHub]
+X-AppImage-Payload-License=MIT
+# Dear upstream developer, please include update information in your AppImage
+# (e.g., with appimagetool -u) so that users can easily update the AppImage
+# Dear upstream developer, please include a digital signature in your AppImage
+# (e.g., with appimagetool -s) so that users can easily verify the authenticity the AppImage
+X-AppImage-Type=2
+X-AppImage-Architecture=x86_64