Add Project Manager release note (#1305)

* add project manager note and deprecate job composer

Author: Bubballoo3

source/release-notes/v4.1-release-notes.rst

@@ -49,6 +49,11 @@ Breaking Changes and Deprecations
 The only breaking changes in 4.1 are with the operating system support changes
 and NodeJS dependency changes listed in the next two sections.
 
+.. warning:: 
+  The Job Composer is officially **deprecated** in 4.1, and will no longer receive new features or bug fixes
+  beyond critical maintenance. Although the :ref:`new Project Manager <project-manager-note>` covers and 
+  surpasses all Job Composer functionality, the Job Composer will remain enabled as a legacy feature until version 5.0.
+
 Operating System Support
 ------------------------
 
@@ -352,6 +357,20 @@ indentation. This is most relevant to languages that rely on consistent indentat
 and YAML. For YAML files, only soft tabs are syntactically supported. Python recommends soft tabs for new 
 projects, but will not allow mixing of hard and soft tabs within a project.
 
+.. _project-manager-note:
+
+The Project Manager
+...................
+
+Version 4.1 enables the Project Manager by default, a new alternative to the Job Composer that brings the
+automatic scheduler interaction of batch connect forms to your personal job scripts. In addition to this core 
+functionality, it also provides support for workflows that can submit multiple dependent jobs at once, and
+easy collaboration on projects among teams. The core functionality will work without modification, but
+collaborative projects work best when used with :ref:`properly configured shared direcories <project_manager_shared_project_root>`. 
+For more details on customization and configuration, see the :ref:`Project Manager docs <project_manager>`, 
+and for an example driven guide intended for users, see :ref:`project-manager-tutorial`.
+
+
 Help, Support and Institutional Integration
 -------------------------------------------