Update README.md [ci skip]

README.md

@@ -1,4 +1,32 @@
 lua-try
 =======
+[![Licence](http://img.shields.io/badge/Licence-MIT-brightgreen.svg)](LICENSE)
+[![Build Status](https://travis-ci.org/moteus/lua-try.svg?branch=master)](https://travis-ci.org/moteus/lua-try)
+[![Coverage Status](https://coveralls.io/repos/moteus/lua-try/badge.png?branch=master)](https://coveralls.io/r/moteus/lua-try?branch=master)
 
 Simple exception support based on LuaSocket
+
+##Usage
+```Lua
+local try = require "try"
+
+local protected_fun = try.protect(function(fname)
+  local f -- local file handle
+
+  -- define finalizer to close file
+  local assert = try.new(function()
+    if f then f:close() end
+  end)
+
+  -- now if `assert` raise error then
+  -- `try` calls finalizer and protected function
+  -- returns nil and error object
+
+  f = assert(io.open(fname))
+
+  assert(do_some_function(f))
+
+  f:close()
+end)
+
+```