adding a basic favicon

Author: leematos

app/assets/images/favicon.ico

@@ -6,7 +6,7 @@
   <%= csrf_meta_tags %>
   <%= stylesheet_link_tag    "application", media: "all", "data-turbolinks-track" => true %>
   <%= javascript_include_tag "application", "data-turbolinks-track" => true %>
-
+  <%= favicon_link_tag %>
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