docs(README): add examples of how to use tox-node with args or config file

Author: NamsooCho

README.md

@@ -72,5 +72,31 @@ hexdump -n 32 -e '8 "%08x" 1 "\n"' /dev/random
 od -vN 32 -An -tx1 /dev/random | tr -d " \n" ; echo
 ```
 
+## Config or CLI
+
+In order to run with config, run with `--config <file>`.
+Example config.yml is below.
+```yaml
+log-type: Stderr
+keys-file: keys
+udp-address: 0.0.0.0:33445
+tcp-addresses:
+  - 0.0.0.0:33445
+motd: "{{start_date}} {{uptime}} Tcp: incoming {{tcp_packets_in}}, outgoing {{tcp_packets_out}}, Udp: incoming {{udp_packets_in}}, outgoing {{udp_packets_out}}"
+bootstrap-nodes:
+  - pk: 1D5A5F2F5D6233058BF0259B09622FB40B482E4FA0931EB8FD3AB8E7BF7DAF6F
+    addr: 198.98.51.198:33445
+  - pk: DA4E4ED4B697F2E9B000EEFE3A34B554ACD3F45F5C96EAEA2516DD7FF9AF7B43
+    addr: 185.25.116.107:33445
+no-lan: True
+```
+Or you can use it with CLI like this
+```sh
+tox-node --keys-file keys \
+    --bootstrap-node 1D5A5F2F5D6233058BF0259B09622FB40B482E4FA0931EB8FD3AB8E7BF7DAF6F 198.98.51.198:33445 \ 
+    --udp-address '0.0.0.0:33445' --tcp-address '0.0.0.0:33445' \
+    --motd "{{start_date}} {{uptime}} Tcp: incoming {{tcp_packets_in}}, outgoing {{tcp_packets_out}}, Udp: incoming {{udp_packets_in}}, outgoing {{udp_packets_out}}"
+```
+
 [libsodium]: https://github.com/jedisct1/libsodium
 [Rust]: https://www.rust-lang.org