Added deprecation notice
diff --git a/README.md b/README.md
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+This repository is deprecated. Further changes should not be made here.
+
+This repository's contents have been moved into the main
+webtools.sourceediting repository under the xsl/tests/ path. Its
+clone URL can be found on 
+https://git.eclipse.org/r/#/admin/projects/sourceediting/webtools.sourceediting .
+This is not, itself, a cloneable URL.