Add section on managing permissions

Author: jgraham

README.md

@@ -156,3 +156,12 @@ You can customize settings by mounting a file from your host into the container:
 volumes:
   - "./settings_docker.py:/src/server/server/settings_docker.py:ro"
 ```
+
+### Managing Permissions
+
+To manage user permissions, first SSH into the production server and then:
+
+* To list permissions for any user run: `sudo docker exec -it webcompatmanager python manage.py ls_permission [ldap email]`
+
+* Grant write-access to the reports to a user run:
+  `sudo docker exec -it webcompatmanager python manage.py add_permission [ldap email] reportmanager_write`