Update readme.md

Author: Capnode

Doc/rcbus.png

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-# Retroworks
+# Retroworks
+
+## Introduction
+Retroworks is an application for working with retro computers, written in .Net, C# and Avalonia. It connects to the retro computer using a serial port, but can also connect to the internal software emulator. It builds and runs on Windos, Mac and Linux.
+
+It is still work in progress and has some support for [RCBus](https://smallcomputercentral.com/rcbus/) type of computers.
+
+![RCBUS](Doc/rcbus.png)<br/>