Setup an interim README.md

README.md

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 # Welcome to the SageMath Windows installation 
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+![work in progress](screenshots/working_site.webp)
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+This repository is a work in progress. It is intended to provide [SageMath](https://www.sagemath.org/) installers for Windows. The previous repository of the same name, which provided such installers up to Sage version 9.3, has been moved to [sage-windows-cygwin](https://github.com/sagemath/sage-windows-cygwin). It has been discontinued because the technique used was increasingly maintenance intensive.
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+Here we plan a new start. We follow four approaches:
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+* A) is developed in connection with the [sage-flatsurf](https://github.com/flatsurf/sage-flatsurf) project. Currently, it installs a flatsurf release as a custom WSL distribution which includes Sage along with functionality of this downstream package. This approach will also provide pure Sage installers in future. To figure out how it works, follow  [these instructions](https://github.com/flatsurf/sage-flatsurf#installation).
+* B) is developed in connection with the [sage-binder](https://github.com/sagemath/sage-binder-env/) project. It installs a Sage release as a custom WSL distribution. To figure out how it works, follow [these instructions](https://github.com/sagemath/sage-binder-env/releases/tag/v10.5).
+* C) is developed as an example for a [projects docker guide](https://github.com/soehms/projects_docker_guide/). It installs Sage via Docker in a custom WSL distribution which is independent of the Sage release. To figure out how it works, follow [these instructions](https://github.com/soehms/projects_docker_guide/#1.).
+* D) is developed as a native Windows build of Sage using meson (see sagemath/sage#38872). There is no installer for testing yet.
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+Any help with our project is welcome. Feel free to open issues in this repo to document your testing experiences or post your suggestions and criticism.