readme: list supported cipher suites

Author: igrr

README.md

@@ -1,8 +1,13 @@
-Replacement for Espressif's libssl, kept as close as possible to [axTLS](http://axtls.sourceforge.net/) source.
+This is an ESP8266 port of [axTLS](http://axtls.sourceforge.net/) library, currently based on axTLS 2.1.2 (SVN version 274). 
 
-Currently based on axTLS 2.1.2 (SVN version 274).
+This library supports TLS 1.2, and the following cipher suites:
 
-[![Build status](https://travis-ci.org/igrr/axtls-8266.svg)](https://travis-ci.org/igrr/axtls-8266)
+Cipher suite name (RFC)           | OpenSSL name  | Key exchange | Encryption |  Hash
+----------------------------------|---------------|--------------|------------|---------
+TLS_RSA_WITH_AES_128_CBC_SHA      | AES128-SHA    |      RSA     |  AES-128   | SHA-1
+TLS_RSA_WITH_AES_256_CBC_SHA      | AES256-SHA    |      RSA     |  AES-256   | SHA-1
+TLS_RSA_WITH_AES_128_CBC_SHA256   | AES128-SHA256 |      RSA     |  AES-128   | SHA-256
+TLS_RSA_WITH_AES_256_CBC_SHA256   | AES256-SHA256 |      RSA     |  AES-256   | SHA-256
 
 ## Using the library
 
@@ -21,7 +26,7 @@ ets_putc      (in ESP8266 ROM)
 
 For use with LwIP raw TCP API, see [compat/README.md](https://github.com/attachix/lwirax/blob/master/README.md)
 
-## Building
+## Building [![Build status](https://travis-ci.org/igrr/axtls-8266.svg)](https://travis-ci.org/igrr/axtls-8266)
 
 To build, add xtensa toolchain to your path, and run `make`. The library will be built in `bin/` directory.