Add CODEOWNERS file (#1397)

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 +1,19 @@
+clang/ @erichkeane, @Fznamznon
+
+clang/**/Driver @mdtoguchi @AGindinson
+
+llvm-spirv/ @AlexeySotkin, @AlexeySachkov
+
+opencl-aot/ @dm-vodopyanov, @AlexeySachkov, @romanovvlad
+
+libdevice/ @asavonic, @vzakhari
+
+sycl/doc/extensions/ @mkinsner, @jbrodman
+
+sycl/doc/ @pvchupin, @kbobrovs
+
+sycl/ @romanovvlad, @bader
+
+xpti/ @tovinkere, @andykaylor
+
+* @bader