Initial README for Grades

lms/djangoapps/grades/README.rst

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+Status: Maintenance
+
+Responsibilities
+================
+
+The grades app is responsible for computing and storing learners' grades in Course Runs. It provides Python and REST
+APIs for retrieving, updating, and managing learners' grades.
+
+The grades app is intended *only* for code related to the core grades subsystem. Any feature (even if it's a grades-related feature) built on top of the core grades subsystem does *not* belong here.
+
+Direction: Keep
+===============
+
+
+Glossary
+========
+
+More Documentation
+==================
+
+`Architecture <https://openedx.atlassian.net/wiki/spaces/AC/pages/159458764/Grades+Architecture>`_
+
+`Decisions <https://github.com/edx/edx-platform/tree/master/lms/djangoapps/grades/docs/decisions>`_