Adopted codeowners file from metpy project; this is a technical owner…

…ship and is not asserting ownership of code/copyright. Any code that does not have an obvious owner (from the perspective of github) will default to @WardF and @DennisHeimbigner

.github/CODEOWNERS

@@ -0,0 +1,9 @@
+# These owners will be the default owners for everything in the repo.
+# Unless a later match takes precedence, global owners
+# will be requested for review when someone opens a pull request.
+*       @WardF @DennisHeimbigner
+
+# Order is important; the last matching pattern takes the most precedence.
+# When someone opens a pull request that only modifies specified file types, only
+# that owner will be requested for a review, not the global owner(s).
+# Email addresses can be used as well as GitHub user names.