feat: added readme and adr (#30030)

* feat: added readme and adr

* refactor: fixed typos

openedx/core/djangoapps/course_live/README.rst

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+This plugin app allow you to enable/disable the live tab in a course. The live
+tab is used to integrate video conferencing tools like "Zoom".

openedx/core/djangoapps/course_live/docs/decisions/001-course-live.rst

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+Course Live Plugin
+_______________
+
+Status
+======
+Accepted
+
+Context
+=======
+
+The new `Course Authoring MFE`_ includes a new UX called "Pages and Resources"
+for configuring different aspects of the course experience such as progress,
+wiki, teams, discussions, etc. all from one place.
+
+This ADR describes the addition of another course app named ``Live``. The
+Live app will be used to configure a video conferencing tool for the course.
+The will be available as a new Tab in the course experience.
+The tool will be added as an LTI integration. We will currently support only
+``Zoom`` as a video conferencing provider. But other providers can also be
+added later.
+
+
+.. _Course Authoring MFE: https://github.com/edx/frontend-app-course-authoring/
+
+
+Decision
+========
+
+We proposed to add the course live as a plugin with the following structure
+
+Course Live App Plugin Class
+-----------------------
+
+The app will be loaded as a plugin and added to `setup.py` with the namespace
+"openedx.course_app".
+
+.. code-block :: python
+
+    class CourseLiveApp:
+        app_id: str = 'live'
+        name: str = 'Live'
+        description: str = 'Enable in-platform video conferencing by
+                            configuring live.'
+
+        @classmethod
+        def is_available(cls, course_key):
+            # The app will be available for everyone
+            # We will initially keep the availability behind a Waffle flag
+            return True
+
+        @classmethod
+        def is_enabled(cls, course_key):
+            # This will be controlled by the CourseLiveConfiguration model
+            return True
+
+        @classmethod
+        def set_enabled(cls, course_key, user, enabled):
+            # This will be controlled by the CourseLiveConfiguration model
+            return enabled
+
+        @classmethod
+        def get_allowed_operations(cls, course_key, user):
+            # Can only enable live for a course if live is configured.
+            return {
+                'enable': Only if configuration exists,
+                'configure': True
+            }