Updated description of grading in syllabus

trying to make competency based grading clearer

schedule.md

@@ -256,6 +256,9 @@ Discussion of Disability Dongle Paper
 {: .homework} [Finding Accessibility](assignments/finding-accessibility.html) Assigned: Summarize a first person account of an access technology
 : 
 
+{: .homework} [Plain Language](assignments/plain-language.html) Assigned: Write something up in plain language. 
+: 
+
 {: .homework} **Post-module Reflection:**  [Accessibility Basics Reflection](https://forms.gle/Wk8C51m5Sbq8RX7W8)
 :