docs: Add documentation for Canvas Integration plugin (#19)

* docs: Add documentation for canvas plugin

src/ol_openedx_canvas_integration/README.rst

@@ -1,5 +1,73 @@
-ol_openedx_canvas_integration
+Canvas Integration Plugin
 =============================
 
+A django app plugin to add Canvas integration to Open edX.
 
-A plugin that enables canvas integration within edX.
+**NOTE:**
+
+We had to make some changes to edx-platform itself in order to add the "Canvas" tab to the instructor dashboard.
+
+The ``edx-platform`` branch/tag you're using must include below commit for ``ol-openedx-canvas-integration`` plugin to work properly:
+
+- https://github.com/mitodl/edx-platform/commit/5b8acfceb7fcebab6b5e3aff0493876f439f2b80
+
+
+Installation
+------------
+
+You can install this plugin into any Open edX instance by using any of the following methods:
+
+
+**Option 1: Install from PyPI**
+
+.. code-block::
+
+    # If running devstack in docker, first open a shell in LMS (make lms-shell)
+
+    pip install ol-openedx-canvas-integration
+
+
+**Option 2: Build the package locally and install it**
+
+Follow these steps in a terminal on your machine:
+
+1. Navigate to ``open-edx-plugins`` directory
+2. If you haven't done so already, run ``./pants build``
+3. Run ``./pants package ::``. This will create a "dist" directory inside "open-edx-plugins" directory with ".whl" & ".tar.gz" format packages for all the "ol_openedx_*" plugins in "open-edx-plugins/src")
+4. Move/copy any of the ".whl" or ".tar.gz" files for this plugin that were generated in the above step to the machine/container running Open edX (NOTE: If running devstack via Docker, you can use ``docker cp`` to copy these files into your LMS container)
+5. Run a shell in the machine/container running Open edX, and install this plugin using pip
+
+Configuration
+------------
+
+**1) edx-platform configuration**
+
+Add the following configuration values to the config file in Open edX. For any release after Juniper, that config file is ``/edx/etc/lms.yml``. These should be added to the top level. **Ask a fellow developer or devops for these values.**
+
+.. code-block::
+
+
+    CANVAS_ACCESS_TOKEN: <some access token value>
+    CANVAS_BASE_URL: <the base URL where Canvas is running>
+
+**2) Add course settings value**
+
+1) Open your course in Studio.
+2) Navigate to "Advanced Settings".
+3) Add a ``canvas_course_id`` value. This should be the id of a course that exists on Canvas.
+
+
+How To Use
+----------
+
+1. In Studio, create/navigate to a course and create some graded assignments/quizzes.
+2. In LMS, open the above course, navigate to the "Instructor" tab, and make sure that you see can see a "Canvas" tab.
+
+
+Some of the functionality available in this tab:
+
+- ``List enrollments on Canvas`` - Show all enrollments for the course on Canvas.
+- ``Merge enrollment list using Canvas`` - Enroll all the users that are present on edX. For the users that don't exist on edX, a ``CourseEnrollmentAllowed`` object will be created.
+- ``Overload enrollment list using Canvas`` - Ensure that enrollment records in edX match the enrollments in Canvas (i.e.: create any enrollments that exist in Canvas but don't exist in edX, and delete enrollments that exist in edX but not in Canvas)
+- ``Push all MITx grades to Canvas`` - Ensure that Canvas has the equivalent assignments/quizzes for the course, and create/update the user grades for those assignments/quizzes in Canvas (The assignments must have a `Published` status on Canvas)
+- ``List Canvas assignments`` - Show a dropdown of all the assignments that are present on Canvas, and upon selecting an assignment, show a list of grades.