Add CODEOWNERS, initial version

CODEOWNERS

@@ -0,0 +1,30 @@
+# 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.
+
+*       @cacraigucar    # NCAR/???
+*       @climbfuji      # NRL
+*       @dustinswales   # NOAA/GSL
+*       @gold2718       # ???
+*       @grantfirl      # NOAA/GSL
+*       @mattldawson    # NCAR/???
+*       @mkavulich      # DTC
+*       @mwaxmonsky     # NCAR/CGD
+*       @nusbaume       # NCAR/CGD
+*       @peverwhee      # NCAR/CGD
+*       @svahl991       # JCSDA
+
+# Add codeowners for these organizations or remove comments before merging PR:
+# UKMO     ?
+# NOAA/EMC ?
+# NCAR/MMM ?
+# ...      ?
+
+# 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/*  docs@example.com