Add CODEOWNERS file to current hash used by NEMSfv3gfs GitHub NCAR master

CODEOWNERS

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+# Lines starting with '#' are comments.
+# Each line is a file pattern followed by one or more owners.
+
+# These owners will be the default owners for everything in the repo.
+#*       @defunkt
+*       @climbfuji @llpcarson @grantfirl
+
+# Order is important. The last matching pattern has the most precedence.
+# So if a pull request only touches javascript files, only these owners
+# will be requested to review.
+#*.js    @octocat @github/js
+
+# You can also use email addresses if you prefer.
+#docs/*  [email protected]