update readme

README.md

@@ -4,12 +4,26 @@
 
 To understand The software-defined networking well, I trying to create a simple SDN with Rust language to support Openflow 1.0 first and 1.3 later.
 
+## Get started
+
+run Tenjin
+
+```bash
+cargo run --release
+```
+
+run mininet
+
+```
+sudo mn --controller=remote,ip=127.0.0.1 --mac --switch=ovsk,protocols=OpenFlow10 --topo=tree,2
+```
+
 ## TODOs
 
 - [x] design structure of code and working.
 - [x] test case. ([Read docs](https://doc.rust-lang.org/book/ch11-01-writing-tests.html))
 - [ ] write more description in README.
-- [ ] handle all messages.
+- [x] handle needed messages.
 - [ ] remove all unwarp.
 
 ## Learning resources