Add examples

examples/greeter/cli/ruby/rpc_client.rb

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+require 'net/http'
+require 'json-rpc-objects/request'
+require 'json-rpc-objects/response'
+
+# RPC Client example in ruby
+#
+# This speaks directly to the service go.micro.srv.greeter
+
+# set the host to the running go.micro.srv.greeter service
+uri = URI("http://localhost:8080")
+method = "Say.Hello"
+request = {:name => "John"}
+
+# create request
+req = JsonRpcObjects::Request::create(method, [request], :id => 1)
+
+# do request
+http = Net::HTTP.new(uri.host, uri.port)
+request = Net::HTTP::Post.new(uri.request_uri)
+request.content_type = 'application/json'
+request.body = req.to_json
+
+# parse response
+puts JsonRpcObjects::Response::parse(http.request(request).body).result["msg"]