[FC-0099] docs: add the default roles and permissions documentation

docs/concepts/core_roles_and_permissions/content_library_roles.rst

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+Core Roles and Permissions: Content Library
+#############################################
+
+This document outlines the built-in roles and permissions associated with the Content Library feature in the Open edX platform.
+
+- `Roles`_
+- `Permissions`_
+    - `Library Permissions`_
+    - `Library Content Permissions`_
+    - `Library Team Permissions`_
+    - `Library Collections Permissions`_
+    - `Permissions Inheritance`_
+- `Roles and Permissions Summary Table`_
+
+Roles
+-----
+
+A **role** is a set of permissions that defines what actions a user can perform. When you **grant a role to a user**, you assign it within a specific scope, which determines where those permissions apply. Here is the list of default roles for Libraries.
+
+- The **Library Admin** has full control over the library, including managing users, modifying content, and handling publishing workflows. They ensure content is properly maintained and accessible as needed.
+
+- The **Library Author** is responsible for creating, editing, and publishing content within a library. They can manage tags and collections but cannot delete libraries or manage users.
+
+- The **Library Contributor** can create and edit content within a library but cannot publish it. They support the authoring process while leaving final publishing to Authors or Admins.
+
+- The **Library User** can view and reuse content but cannot edit or delete anything.
+
+Permissions
+-----------
+
+The following permissions are associated with the content library roles:
+
+Library Permissions
+=======================
+
+- **View the library** (``view_library``): Allows users to view the content library.
+- **Manage library tags** (``manage_library_tags``): Allows users to manage the tags associated with library items.
+- **Delete the library** (``delete_library``): Allows users to delete the entire content library.
+
+
+Library Content Permissions
+===============================
+
+- **Edit library content** (``edit_library_content``): Allows users to edit existing content within the library.
+- **Publish library content** (``publish_library_content``): Allows users to publish content to or from the library.
+- **Reuse library content** (``reuse_library_content``): Allows users to reuse content from the library in other contexts.
+
+
+Library Team Permissions
+=============================
+
+- **View the library team** (``view_library_team``): Allows users to view the list of users or roles associated with the library.
+- **Manage the library team** (``manage_library_team``): Allows users to add, remove, or change the roles of users in the library team.
+
+
+Library Collections Permissions
+===================================
+
+- **Create library collections** (``create_library_collection``): Allows users to create new collections within the library.
+- **Edit library collections** (``edit_library_collection``): Allows users to modify existing collections within the library.
+- **Delete library collections** (``delete_library_collection``): Allows users to delete collections within the library.
+
+Permissions Inheritance
+========================
+
+* **Managing library tags** (``manage_library_tags``) implies **editing library content** (``edit_library_content``).
+* **Deleting the library** (``delete_library``) implies **editing library content** (``edit_library_content``).
+* **Publishing library content** (``publish_library_content``) implies **editing library content** (``edit_library_content``).
+* **Editing library content** (``edit_library_content``) implies **viewing the library** (``view_library``).
+* **Reusing library content** (``reuse_library_content``) implies **viewing the library** (``view_library``).
+* **Publishing library content** (``publish_library_content``) implies **viewing the library** (``view_library``).
+* **Managing the library team** (``manage_library_team``) implies **viewing the library team** (``view_library_team``).
+* **Deleting a library collection** (``delete_library_collection``) implies **editing a library collection** (``edit_library_collection``).
+* **Creating a library collection** (``create_library_collection``) implies **editing a library collection** (``edit_library_collection``).
+* **Editing a library collection** (``edit_library_collection``) implies **viewing the library** (``view_library``).
+
+
+Roles and Permissions Summary Table
+------------------------------------
+
+.. table:: Matrix of Content Library Roles and Permissions
+   :widths: auto
+
+   ============================= ================= ================ ===================== ==============
+   Permissions                   Library Admin     Library Author   Library Contributor   Library User
+   ============================= ================= ================ ===================== ==============
+   **Library**
+   view_library                  ✅                 ✅                ✅                      ✅
+   manage_library_tags           ✅                 ✅                ✅                      ❌
+   delete_library                ✅                 ❌                ❌                      ❌
+   **Content**
+   edit_library_content          ✅                 ✅                ✅                      ❌
+   publish_library_content       ✅                 ✅                ❌                      ❌
+   reuse_library_content         ✅                 ✅                ✅                      ✅
+   **Team**
+   view_library_team             ✅                 ✅                ✅                      ✅
+   manage_library_team           ✅                 ❌                ❌                      ❌
+   **Collections**
+   create_library_collection     ✅                 ✅                ✅                      ❌
+   edit_library_collection       ✅                 ✅                ✅                      ❌
+   delete_library_collection     ✅                 ✅                ✅                      ❌
+   ============================= ================= ================ ===================== ==============
+
+
+**Maintenance chart**
+
++--------------+-------------------------------+----------------+--------------------------------+
+| Review Date  | Working Group Reviewer        | Release        | Test situation                 |
++--------------+-------------------------------+----------------+--------------------------------+
+| 2025-10-13   | RBAC Project                  | Ulmo           | TO DO                          |
++--------------+-------------------------------+----------------+--------------------------------+

docs/concepts/core_roles_and_permissions/index.rst

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+Core Roles and Permissions
+############################
+
+.. toctree::
+    :maxdepth: 1
+
+    content_library_roles

docs/concepts/index.rst

@@ -1,2 +1,7 @@
 Concepts
 ########
+
+.. toctree::
+   :maxdepth: 2
+
+   core_roles_and_permissions/index