Add policy for adding new role

policies/adding-new-role-members.md

@@ -34,4 +34,4 @@ The process is:
 8. The nominee receives the necessary GitHub or other permissions for the new role.
 9. The nominee gets added to the astropy-core-maintainers mailing list.
 10. The Coordination Committee member sends a confirmation message to the nominee
-   to complete the process.
+    to complete the process.

policies/adding-new-roles.md

@@ -0,0 +1,23 @@
+This document describes the process for adding new named roles. This
+document is *not* about how people are added to the roles, which is covered under
+[adding-new-role-members.md](https://github.com/astropy/astropy-project/blob/main/policies/adding-new-role-members.md).
+
+The process is:
+
+1. A voting member or maintainer in a related role, after consulting with other members in
+   related roles, opens a PR to [astropy.github.com](https://github.com/astropy/astropy.github.com)
+   to add this new role. The PR must describe clearly why this role is essential to the Astropy
+   Project and has clear description of associated responsibilities. If this role has sub-roles,
+   those must be clarified as well in the same manner. This new role must be declared Unfilled
+   for now (separation of concerns). This new role cannot duplicate any existing roles.
+2. The PR author sends out a notice of this PR to astropy-dev mailing list, with cc to the
+   Coordination Committee, starting a two-week clock on the feedback period
+   [as required by APE0](https://github.com/astropy/astropy-APEs/blob/main/APE0.rst#responsibilities-and-authority).
+3. Once the two week period has elapsed, the Coordination Committee makes a
+   final decision based on any feedback.
+4. If the new role is confirmed, the PR is merged. Otherwise, it is closed without merge.
+5. The Coordination Committee member sends an update to the astropy-dev notice
+   with an update, regardless of the decision.
+6. If new role is accepted in Step 4, proceed to
+   [adding-new-role-members.md](https://github.com/astropy/astropy-project/blob/main/policies/adding-new-role-members.md)
+   for the next steps.