created a prototype of a config file

config.json

@@ -0,0 +1,13 @@
+{
+  "forwarding": [
+    {
+      "from": "127.0.0.1:12345",
+      "to": "127.0.0.1:12346",
+      "doReverse": true
+    }
+  ],
+  "blacklist": [
+    "127.0.0.1:11111",
+    "127.0.0.1:58109"
+  ]
+}