Add Logooli (rag)

Requested for translatewiki at
https://translatewiki.net/wiki/Thread:Support/Adding_a_new_language_-_Lologooli

There are several variants of the autonym online.
The images at https://lologooli.org/ show that "Lologooli"
is probably a good variant, at least for starters.

data/language-data.json

@@ -3233,6 +3233,13 @@
             ],
             "anqash qichwa"
         ],
+        "rag": [
+            "Latn",
+            [
+                "AF"
+            ],
+            "Lologooli"
+        ],
         "rap": [
             "Latn",
             [