Add more information about Rubyric exercises

An annotation about testing Rubyric in a local environment is added.
In addition, an implementation of a Rubyric exercise is added.
Having this exercise in the A+ manual will allow
the reader to understand better how Rubyric works in production.

exercises/hello_rubyric/config.yaml

@@ -0,0 +1,17 @@
+
+_external: true
+title: Hello Rubyric
+description: A simple grading example with Rubyric and Python
+max_submissions: 10
+max_points: 10
+points_to_pass: 6
+min_group_size: 1
+max_group_size: 2
+key: rubyric-python
+lti: Rubyric
+lti_context_id: ''
+lti_resource_link_id: hello-world
+lti_open_in_iframe: true
+lti_aplus_get_and_post: true
+url: /aplus_exercise
+

rubyric/02_getting_started.rst

@@ -24,6 +24,22 @@ a new menu item in A+ choose Edit course and Menu and press Add new menu item.
 You can also choose to use Rubyric through Haka login. In that case you don't
 need to add Rubyric to menu.
 
+.. important::
+
+  If you want to test Rubyric locally, you must read the
+  `Official Rubyric documentation <https://github.com/Aalto-LeTech/rubyric/blob/master/doc/rubyric.md#connect-local-rubyric-to-a-course-in-docker-optional>`_
+  and follow the instructions on how to use a local copy of Rubyric along with A+.
+  It is also important to mention that currently testing Rubyric locally can be
+  slightly difficult. Therefore, we recommend adding the desired `submit`
+  directives to the course along with the corresponding `config.yaml` file,
+  which should contains the configuration of the Rubyric exercise. Once you have
+  verified manually that all the parameters are correct, you can deploy the course
+  in our `testing environment <https://minus.cs.aalto.fi>`_ and only then verify that
+  you can configure and use Rubyric as expected.
+
+  For more information on how to deploy in our testing environment please send
+  an email to [email protected]
+
 Configure course at Rubyric
 ---------------------------
 
@@ -196,3 +212,18 @@ delivered to Rubyric where they can be assessed.
 If you want students to submit straight to Rubyric, you can provide students
 with submission url which they can use. Submission url is shown at assignment
 page.
+
+Example
+.......
+
+The following example will show you how Rubyric exercises work. Please submit
+your exercise and contact us through email [email protected]. We will show
+you how the assignments are reviewed and how you can make use of Rubyric in your
+courses.
+
+.. submit:: rubyric 10
+  :config: exercises/hello_rubyric/config.yaml
+
+.. important::
+
+  Please continue reading the whole chapter before sending us the email.

rubyric/03_rubrics_and_reviews.rst

@@ -179,4 +179,4 @@ reviews. Feedback from all chosen reviews for the submission will be included
 regardless of which you choose. Non-numerical grades, e.g. "Failed" or 
 "Boomerang", cannot be sent to A+. Thus non-numerical grades will be ignored
 when calculating the sent points although the feedback text will still be 
-delivered.
+delivered.