Update README.md

README.md

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-# ECP5 OSS Flow Template
+# Groovylight
 
-This repo contains a basic setup for ECP5 development.
+A GroovyMiSTer to HUB75 display platform. Play retro games in pixel-perfection!
-It's designed to serve as a modest baseline, more can be added easily
-to adapt to each project.
 
-Features:
+(This project is incomplete. More documentation and screenshots will be added as it is developed)
-- Nix flake for toolchains and dependencies
-- Test infra
-- Github Actions Workflow
 
+## Features
+
+- Networked display reciever compatible with Groovy-based protocols for low-latency graphics.
+- Supports 5 "strings" of HUB75 panels, enabling 320x256 maximum display resolution when using 128x64 panels.
+- Supports complex display transforms, such as rotation.
+
+
+## Building your Groovylight
+
+The hardware involved in making a groovylight is simple: It uses the Colorlight 5A-75B Receiver board as the driver and supports various HUB75
+displays. When thinking about displays, consider target size, display resolution, and panel layout. Due to RAM limitations,
+it required that the total number of pixels per-row does not exceed 256. This means that if you use a 128x64 panel, you can have
+up to 2 of them in series. If you're using a 64x64 panel (not recommended for most setups), you can have 4.
+A total of 5 strings of HUB75 panels are supported, *but they must be the same size*.
+
+You can see the setup of a 240p-size display below. It uses 10 128x64 P2.5 panels. One string (2 panels) is rotated on the edge
+to get 320 pixels, and there are 8 extra pixels on the top and bottom.
+
+## Simulator
+
+A Verilator-based simulator is used for behavioral testing but can also be used to experiment with display layouts.
+The sources can be found in `sim/`.