Qml/main: add add mod action

src/leek/qml/Main.qml

@@ -25,6 +25,15 @@ Kirigami.ApplicationWindow {
     pageStack.initialPage: Kirigami.ScrollablePage {
         title: "Mods"
 
+        actions: [
+            Kirigami.Action {
+                // download-symbolic and install-symbolic are the same icon
+                // but install looks worse for some reason
+                icon.name: "download-symbolic"
+                text: "Add mod"
+            }
+        ]
+
         Kirigami.CardsListView {
             id: modsView