Add CODEOWNERS (#3822)

CODEOWNERS

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+# In this project, we use CODEOWNERS to identify people who are likely to know
+# who should review a pull request.
+#
+# People listed in this file are committing to respond in a timely fashion to
+# PRs in the selected areas. However, that response doesn't have to be a full
+# code review; it could also take any of these forms:
+#
+# - "I intend to review this but I can't yet. Please leave me a message if I
+#   haven't responded by (a specific date in the near future)."
+#
+# - "I think (a specific other contributor) should review this." (Note that the
+#   best reviewer for a PR may not necessarily be listed in this file.)
+#
+# People must only be added to this file if they've agreed to provide one of
+# the above responses in a reasonable amount of time for every PR to which
+# they're assigned.
+#
+# We only ask for this commitment from people who are employed full-time to
+# work on this project. We gratefully welcome reviews from other contributors,
+# but we don't believe it's fair to ask volunteers to respond quickly.
+
+# If none of the later patterns match, assign to anyone. This team is the
+# parent of all the other teams and automatically includes everyone on those
+# teams.
+* @loganek @lum1n0us @no1wudi @wenyongh @xujuntwt95329 @yamt
+
+# Some parts of the project require more specialized knowledge. In those areas
+# we designate smaller groups who are more likely to be aware of who's working
+# in specific areas.