add README.md for example codes

examples/README.md

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+# BytePack Examples: ASIO, Qt, and Raw Sockets
+## Content
+- [Boost.Asio](boost_asio)
+    - It currently has client and server examples for UDP protocol. Client sends different types of messages to server
+      via same port. Server receives the messages, deserializes them based on their type and prints them to the console.
+- [Qt Network]() _(coming soon)_
+- [Raw Sockets]() _(coming soon)_
+
+## License
+Example codes in the `examples` folder are provided for demonstration purposes only and is not covered under any specific license terms. Users are free to use it as they wish.