Update README.md

Author: lganzzzo

client/README.md

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+# websocket client
+
+Simple example of the websocket client. Built with oat++ (AKA oatpp) web framework.
+
+See more:
+
+- [Oat++ Website](https://oatpp.io/)
+- [Oat++ Github Repository](https://github.com/oatpp/oatpp)
+- [Get Started With Oat++](https://oatpp.io/docs/start)
+
+## Overview
+
+### Project layout
+
+```
+|- CMakeLists.txt                         // projects CMakeLists.txt
+|- src/
+|    |
+|    |- WSListener.hpp                    // WebSocket listeners are defined here
+|    |- App.cpp                           // main() is here
+|
+|- utility/install-oatpp-modules.sh       // utility script to install required oatpp-modules.  
+```
+
+## Build and Run
+
+### Using CMake
+
+**Requires:** [oatpp](https://github.com/oatpp/oatpp), and [oatpp-websocket](https://github.com/oatpp/oatpp-websocket) 
+modules installed. You may run `utility/install-oatpp-modules.sh` 
+script to install required oatpp modules.
+
+After all dependencies satisfied:
+
+```
+$ mkdir build && cd build
+$ cmake ..
+$ make 
+$ ./websocket-client-exe       # - run application.
+```
+