Added README

Author: drclaws

client/README.MD

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+# Simple Server/Client
+
+Example of simple server/client that can work with both UPD and TCP protocols
+
+## Requirements
+  + Linux
+  + Compiler with C++11 support
+  + CMake >= 3.0.0
+
+## Description
+
+Neither server nor client uses additional threads and both based on event listening technologies.
+
+Server uses 'epoll' method to work with multiple UPD and TCP sessions at same time
+
+Client works with one server by chosen protocol and uses 'select' method to listen events.
+
+Both application has been provided with interative menus so you don't get lost.