Added readme

Readme.md

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+
+# Connect JSON-RPC
+
+The _jsonrpc_ middleware provides JSON-RPC 2.0 support. Below is an example exposing the _add_ and _sub_ methods:
+
+	  var math = {
+	      add: function(a, b, fn){
+	          fn(null, a + b);
+	      },
+	      sub: function(a, b, fn){
+	          fn(null, a - b);
+	      }
+	  };
+
+	  var date = {
+	      time: function(fn){
+	          fn(null, new Date().toUTCString());
+	      }
+	  };
+
+	  connect.createServer(
+	      connect.jsonrpc(math, date)
+	  );
+
+When you wish to pass an exception simply invoke `fn(err)`, or pass the error code `fn(jsonrpc.INVALID_PARAMS)`. Otherwise `fn(null, result)` will respond with the given results.
+
+## License 
+
+(The MIT License)
+
+Copyright (c) 2010 Sencha Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.