Add do not edit message

Author: ChrisOwen101

GRADING.md

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+<!--
+Do not edit this file.
+Make a change to the template and then pull changes
+https://github.com/CodeYourFuture/CYF-Coursework-Template
+-->
+
 # Grading
 
 All coursework is graded using the Marking Guide found on the Syllabus.
@@ -11,5 +17,3 @@ If you have any questions on these guidelines - please ask.
 Your code should follow our Coding Standards or it will be marked poorly.
 
 http://syllabus.codeyourfuture.io/guides/coding-standards
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HOW-TO-SUBMIT.md

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+<!--
+Do not edit this file.
+Make a change to the template and then pull changes.
+https://github.com/CodeYourFuture/CYF-Coursework-Template
+-->
+
 # How To Submit Your Coursework
 
 You should use Git & Github to submit your coursework as a pull request.