added example configuration

config.json

@@ -0,0 +1,8 @@
+{
+    "upload_folder": "./uploads",
+    "max_file_size": 104857600,
+    "expiration_time": 604800,
+    "data_file": "data.db",
+    "base_url": "http://localhost:5000/",
+    "name": "up.x1b.dev"
+}