Create CODEOWNERS (#1)

Author: MaxDesiatov

.github/CODEOWNERS

@@ -0,0 +1,18 @@
+# This file is a list of the people responsible for ensuring that patches for a
+# particular part of Swift are reviewed, either by themselves or by someone else.
+# They are also the gatekeepers for their part of Swift, with the final word on
+# what goes in or not.
+#
+# The list is sorted by surname and formatted to allow easy grepping and
+# beautification by scripts.  The fields are: name (N), email (E), web-address
+# (W), PGP key ID and fingerprint (P), description (D), and snail-mail address
+# (S).
+
+# N: Max Desiatov
+# E: m_desiatov@apple.com
+
+###
+
+# The following lines are used by GitHub to automatically recommend reviewers.
+
+* @MaxDesiatov