meta: add README.md

README.md

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+# lil
+
+`lil` is a library for modesetting Intel integrated GPUs.
+
+## State
+
+> **TL;DR: don't expect this to work yet, API are absolutely not stable yet**
+
+Currently, `lil` is in active development. It might or might not work on your hardware, and hardware `lil` supports might not operate correctly in all cases. All APIs, public-facing or not, are not yet stable. They can and will change without notice, at least until we start tagging releases.