learnflakes: add info in config about 180 day password expiry

src/Jackett.Common/Definitions/learnflakes.yml

@@ -65,6 +65,10 @@ settings:
     options:
       "desc": "desc"
       "asc": "asc"
+  - name: info_results
+    type: info
+    label: Search results
+    default: "If you are getting the error <b>Found no results while trying to browse this tracker</b> then first access the site with your browser and check that you are not being forced to change your password because it has expired after 180 days."
 
 login:
   path: ?p=home&pid=1