extend readme

README.md

@@ -1,9 +1,23 @@
-# retrogolib - Golang library for retro console tooling development
+## RetroGoLib - a Golang library for retro console tooling development
 
 [![Build status](https://github.com/retroenv/retrogolib/actions/workflows/go.yaml/badge.svg?branch=main)](https://github.com/retroenv/retrogolib/actions)
 [![go.dev reference](https://img.shields.io/badge/go.dev-reference-007d9c?logo=go&logoColor=white&style=flat-square)](https://pkg.go.dev/github.com/retroenv/retrogolib)
 [![Go Report Card](https://goreportcard.com/badge/github.com/retroenv/retrogolib)](https://goreportcard.com/report/github.com/retroenv/retrogolib)
-[![codecov](https://codecov.io/gh/retroenv/retrogolib/branch/main/graph/badge.svg?token=jiBBxNmmVB)](https://codecov.io/gh/retroenv/retrogolib)
+[![codecov](https://codecov.io/gh/retroenv/retrogolib/branch/main/graph/badge.svg?token=jiBBxNmmVB)](https://app.codecov.io/gh/retroenv/retrogolib)
+
+## Overview
+
+RetroGoLib is a Golang library designed to simplify the development of tools for retro consoles.
+It provides a set of functionalities that can be used to create tools for various retro consoles,
+like emulators and debugging tools, all while keeping dependencies to a minimum.
+
+## Current system support
+
+CPUs:
+- 6502
+
+Systems:
+- NES
 
 ## Project layout