Add main readme to the repository

README.md

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+[![Build for Windows using MSVC](https://github.com/geissomatik/geiss/actions/workflows/windows-msvc.yml/badge.svg)](https://github.com/geissomatik/geiss/actions/workflows/windows-msvc.yml)
+
+
+# Geiss Screensaver and Winamp plug-in
+
+This repository holds the latest code of the Geiss Screensaver and Winamp plug-in;
+for general information about Geiss please see:
+
+- [At a glance: Geiss](https://www.geisswerks.com/about_geiss.html)
+- [Official Homepage of the Geiss Screensaver and Winamp plug-in](https://www.geisswerks.com/geiss/)
+- [Screenshots from Geiss](https://www.geisswerks.com/geiss/shots.html)
+- [How 'Geiss' Worked](https://www.geisswerks.com/geiss/secrets.html)
+- [Geiss @ WinampHeritage.com](https://winampheritage.com/visualizations/geiss)
+- [Geisswerks — home page of Ryan M. Geiss](https://www.geisswerks.com/)
+
+For a YouTube video showing Geiss in action, please click:
+
+[![Video" Geiss visualization for Winamp/MediaMonkey/JetAudio" on YouTube](https://img.youtube.com/vi/pBCvhBcEpHQ/hqdefault.jpg)](https://www.youtube.com/watch?v=pBCvhBcEpHQ)
+
+
+# Compiling locally
+
+In order to compile the Geiss Winamp plug-in and/or the Geiss Screensaver,
+you need:
+
+- A Git clone or snapshort of this repository
+- CMake >=3.15
+- Microsoft Visual Studio >=9/2008 (due to the current use of MSVC style assembly)
+
+Then, the code can be built using:
+
+```console
+# cmake -G "Visual Studio 17 2022" -A Win32 -DCMAKE_BUILD_TYPE=RelWithDebInfo .
+# cmake --build .
+```