Marking External and ExtraTests as experimental

Pavel V Chupin · Pavel V Chupin · commit a26d230a7f2d · 2021-03-30T18:25:15.000-07:00
diff --git a/SYCL/External/README.md b/SYCL/External/README.md
@@ -1,3 +1,10 @@
+---
+
+**NOTE** This is experimental extension of test suite. Could be dropped or
+extended further at some later point.
+
+---
+
 # Overview
 
 "External" tests directory has necessary infrastructure for running tests where
diff --git a/SYCL/ExtraTests/README.md b/SYCL/ExtraTests/README.md
@@ -1,3 +1,10 @@
+---
+
+**NOTE** This is experimental extension of test suite. Could be dropped or
+extended further at some later point.
+
+---
+
 # Overview
 
 "ExtraTests" directory contains infrastructure for picking up LIT style tests
