added burger menu, About section and Preferences menu item, which is WIP

com.angoosh.RDPConnect/com.angoosh.RDPConnect.yml

@@ -81,6 +81,7 @@ modules:
       - install -Dm755 rdpconnect.sh /app/bin/rdpconnect
       - install -Dm755 main.py /app/
       - install com.angoosh.RDPConnect.ui /app/
+      - install menu.ui /app/
       - install style-dark.css /app/
       - install style-light.css /app/
       - install -Dm644 com.angoosh.RDPConnect.svg /app/share/icons/hicolor/scalable/apps/
@@ -104,4 +105,6 @@ modules:
       - type: file
         path: com.angoosh.RDPConnect.desktop
       - type: file
-        path: com.angoosh.RDPConnect.metainfo.xml
+        path: com.angoosh.RDPConnect.metainfo.xml
+      - type: file
+        path: menu.ui