Rename permissions page and fill in default roles access

Author: RebeccaTamachiro

src/content/docs/secrets-store/access-control.mdx

@@ -0,0 +1,19 @@
+---
+title: Secrets Store access control
+pcx_content_type: concept
+sidebar:
+  order: 2
+  label: Access control
+description: Learn about role-based access control with Cloudflare Secrets Store
+---
+
+Secrets Store allows security administrators to have more control, by implementing role-based access. Refer to the list below for default role definitions. For details about roles at Cloudflare, refer to [Fundamentals](/fundamentals/setup/manage-members/).
+
+- **Super administrator**: Can create, edit, delete, and view secrets. Can also add the binding to access a Secrets Store secret to a `wrangler.toml` file.
+- **Workers admin**: Cannot create, edit, nor delete secrets. Can add the binding to access a Secrets Store secret to a `wrangler.toml` file.
+
+## Assign create/edit/delete permissions
+
+Super administrators can grant create/edit/delete permissions to other users via the following API call:
+
+(TBD)