[llvm] [libsycl] Add Maintainers.rst file (PR #168550)

[Mariya Podchishchaeva via llvm-commits]

================
@@ -0,0 +1,16 @@
+=====================
+libsycl Maintainers
+=====================
+
+This file is a list of the
+`maintainers <https://llvm.org/docs/DeveloperPolicy.html#maintainers>`_ for
+Clang.
----------------
Fznamznon wrote:

libsycl
```suggestion
libsycl.
```

https://github.com/llvm/llvm-project/pull/168550