Add CODEOWNERS file

Let's use code owners to facilitate code review process.
Using this file reviewers will be assigned automatically.

More information can be found on the GitHub documentation
https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners

Signed-off-by: Alexey Bader <[email protected]>

Author: bader

.github/workflows/CODEOWNERS

@@ -0,0 +1,15 @@
+clang/ @erichkeane, @Fznamznon
+
+llvm-spirv/ @AlexeySotkin, @AlexeySachkov
+
+opencl-aot/ @dm-vodopyanov
+
+sycl/doc/extensions/ @mkinsner, @jbrodman
+
+sycl/doc/ @pvchupin, @kbobrovs
+
+sycl/ @romanovvlad
+
+xpti/ @tovinkere
+
+* @bader