add desktop files

firefox and thunderbird profile manager now show up in applicatin lists

.local/share/applications/userapp-Telegram.desktop

@@ -0,0 +1,8 @@
+[Desktop Entry]
+Encoding=UTF-8
+Version=1.0
+Type=Application
+NoDisplay=true
+Exec=/usr/bin/telegram-desktop -- %u
+Name=Telegram Desktop
+Comment=Custom definition for Telegram Desktop