CODEOWNERS: Support distribution of code reviews via team assignments

Individual maintainer assignments within CODEOWNERS mean that we
cannot take advantage of GitHub code review distribution schemes
for team review assignments.

In this commit, we switch to team assignments within CODEOWNERS.

A common complaint with this approach is that unless you are a part
of the GitHub organization, you will not be able to view a team's
membership/understand who the maintainers of a project are.

To provide visibility into the maintainer list, we've added a
MAINTAINERS.md here as well.

Signed-off-by: Stephen Augustus <[email protected]>

.github/CODEOWNERS

@@ -4,12 +4,8 @@
 # the repo. Unless a later match takes precedence,
 # the following users/teams will be requested for
 # review when someone opens a pull request.
-# TODO(owners): For ease of management, this should eventually shift to a
-#               defined GitHub team instead of individual usernames
-* @azeemshaikh38 @justaugustus @laurentsimon @naveensrinivasan @spencerschrock @raghavkaul
+* @ossf/scorecard-maintainers
 
 # Docs
-# TODO(owners): For ease of management, this should eventually shift to a
-#               defined GitHub team instead of individual usernames
-*.md @olivekl
-/docs/ @olivekl
+*.md @ossf/scorecard-doc-maintainers
+/docs/ @ossf/scorecard-doc-maintainers

MAINTAINERS.md

@@ -0,0 +1,21 @@
+# Maintainers
+
+## `scorecard-maintainers`
+
+- Stephen Augustus ([@justaugustus](https://github.com/justaugustus)), Cisco
+- Raghav Kaul ([@raghavkaul](https://github.com/raghavkaul)), Google
+- Spencer Schrock ([@spencerschrock](https://github.com/spencerschrock)), Google
+- Azeem Shaikh [@azeemshaikh38](https://github.com/azeemshaikh38), Google
+- Laurent Simon ([@laurentsimon](https://github.com/laurentsimon)), Google
+- Naveen Srinivasan ([@naveensrinivasan](https://github.com/naveensrinivasan)), Independent
+
+## `scorecard-doc-maintainers`
+
+- Kara Olive ([@olivekl](https://github.com/olivekl)), Google
+
+## Emeritus
+
+Former maintainers are listed here.
+Thanks for your contributions to Scorecard!
+
+-