linux-arts: Add README for the repository

Add REAME with details on the repository and what is it for.
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+Linux Kernel Autogenerated Regression Tests
+linux-arts repository is dedicated to preserving the autogenerated
+regression tests for regression testing.
+Automates testing entities such as Syzbot generate reproducers to test
+the kernel. It is a manual process to download reproducers and once the
+bug is fixed, kernel developers loose track of these reproducers.
+As per the decision made at a session at the Maintainers Summit 2019,
+this git repository is created to preserve the reproducers.
+Please find the details on the discussion that lead to this decision