Update README.md

README.md

@@ -3,7 +3,13 @@ picotls
 
 Picotls is a [TLS 1.3](https://tlswg.github.io/tls13-spec/) implementation written in C.
 
-At the moment, the library implements Draft 17 of the specification (1-RTT ECDH + server-certificate + AES128-GCM only).
+At the moment, the library implements Draft 18 of the specification. List of supported features are as follows:
+
+* public-key exchange: P256
+* aead cipher: AES128-GCM-SHA256
+* server-certificates using RSA or ECDSA signatures
+* PSK and PSK-DHE
+* early-data
 
 Primary goal of the project is to create a fast, tiny TLS 1.3 implementation that can be used with the HTTP/2 protocol stack and possibly the upcoming QUIC stack of the [H2O HTTP/2 server](https://h2o.examp1e.net).
 
@@ -31,6 +37,20 @@ Connect to the test server:
 % ./cli 127.0.0.1 8443
 ```
 
+Using resumption:
+```
+% ./cli -s session-file 127.0.0.1 8443
+```
+The session-file is read-write.
+The cli server implements a single-entry session cache.
+The cli server sends NewSessionTicket when it first sends application data after receiving ClientFinished.
+
+Using early-data:
+```
+% ./cli -s session-file -e 127.0.0.1 8443
+```
+When `-e` option is used, client first waits for user input, and then sends CLIENT_HELLO along with the early-data.
+
 License
 ---
 MIT