Update CODEOWNERS

Grant code owners to specific groups in the rapidsai org

.github/CODEOWNERS

@@ -1,37 +1,8 @@
-# This is a comment.
-# Each line is a file pattern followed by one or more owners.
+#Admins & project code owners
+*           @rapidsai/admins @rapidsai/cudf-admin @rapidsai/cudf-codeowners
 
-# These owners will be the default owners for everything in
-# the repo. Unless a later match takes precedence,
-# @global-owner1 and @global-owner2 will be requested for
-# review when someone opens a pull request.
-*       @global-owner1 @global-owner2
+#cpp code owners
+cpp/*       @rapidsai/cudf-cpp-codeowners
 
-# Order is important; the last matching pattern takes the most
-# precedence. When someone opens a pull request that only
-# modifies JS files, only @js-owner and not the global
-# owner(s) will be requested for a review.
-*.js    @js-owner
-
-# You can also use email addresses if you prefer. They'll be
-# used to look up users just like we do for commit author
-# emails.
-*.go [email protected]
-
-# In this example, @doctocat owns any files in the build/logs
-# directory at the root of the repository and any of its
-# subdirectories.
-/build/logs/ @doctocat
-
-# The `docs/*` pattern will match files like
-# `docs/getting-started.md` but not further nested files like
-# `docs/build-app/troubleshooting.md`.
-docs/*  [email protected]
-
-# In this example, @octocat owns any file in an apps directory
-# anywhere in your repository.
-apps/ @octocat
-
-# In this example, @doctocat owns any file in the `/docs`
-# directory in the root of your repository.
-/docs/ @doctocat
+#python code owners
+python/*    @rapidsai/cudf-python-codeowners