add freqao backend machinery, user interface, documentation

freqtrade/commands/cli_options.py

@@ -614,4 +614,16 @@ AVAILABLE_CLI_OPTIONS = {
               "that do not contain any parameters."),
         action="store_true",
     ),
+
+    "freqaimodel": Arg(
+        '--freqaimodel',
+        help='Specify a custom freqaimodels.',
+        metavar='NAME',
+    ),
+
+    "freqaimodel_path": Arg(
+        '--freqaimodel-path',
+        help='Specify additional lookup path for freqaimodels.',
+        metavar='PATH',
+    ),
 }