refresh example config

example_config.json

@@ -0,0 +1,24 @@
+{
+  "network": "tcp",
+  "addr": ":6881",
+
+  "tracker": {
+    "driver": "memory"
+  },
+
+  "backend": {
+    "driver": "noop"
+  },
+
+  "private_tracker": false,
+  "freeleech": false,
+  "whitelist": false,
+  "purge_inactive_torrents": true,
+  "allow_ip_spoofing": true,
+  "dual_stacked_peers": true,
+
+  "announce": "30m",
+  "min_announce": "15m",
+  "request_timeout": "10s",
+  "default_num_want": 50
+}