Move search index from chronos

aleksis/core/search_indexes.py

-from .models import Group, Person
+from .models import Group, Person, Room
 from .util.search import Indexable, SearchIndex
 
 
@@ -12,3 +12,9 @@ class GroupIndex(SearchIndex, Indexable):
     """Haystack index for searching groups."""
 
     model = Group
+
+
+class RoomIndex(SearchIndex, Indexable):
+    """Haystack index for searching rooms."""
+
+    model = Room