Add new variant 'Getting Started' needle

The 'largetext' version of the needle is needed when there's
some notification displaying over the window title, it seems
F28's current font rendering doesn't match the current version
of that needle...

Signed-off-by: Adam Williamson <awilliam@redhat.com>

needles/gnome/getting_started-largetext-f28-20190222.json

@@ -0,0 +1,17 @@
+{
+  "area": [
+    {
+      "xpos": 166,
+      "height": 30,
+      "type": "match",
+      "width": 121,
+      "ypos": 123
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "getting_started",
+    "LANGUAGE-english",
+    "LANGUAGE-arabic"
+  ]
+}