Add large warning header to README.md (#106)

The current README.md does not give any indication that OpenZFS for windows is still in a pre-release state. Users should be redundantly informed of any potential data loss that may result from using a system not ready for production.
openzfsonwindows · Jul 20, 2022 · b246ff6 · b246ff6
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diff --git a/README.md b/README.md
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+# ⚠️WARNING: OpenZFS for Windows is in a pre-release state.⚠️
+## ⛔ Do *not* use it for writing *or* reading critical data! ⛔
+## ⛔ Doing so may corrupt your zpool and cause permanent data loss! ⛔
+
 ![img](https://openzfs.github.io/openzfs-docs/_static/img/logo/480px-Open-ZFS-Secondary-Logo-Colour-halfsize.png)
 
 OpenZFS is an advanced file system and volume manager which was originally