Merge pull request #95 from saiutkarsh33/branch-DG-update

Update DG

docs/DeveloperGuide.md

@@ -204,6 +204,9 @@ Step 4. The user now decides that adding the person was a mistake, and decides t
 
 <puml src="diagrams/UndoRedoState3.puml" alt="UndoRedoState3" />
 
+Step 5. The user wants to set the course name. He enters the command `setcrs CS2103T`, causing the course name to appear on the main window's title.
+
+
 
 <box type="info" seamless>
 
@@ -477,3 +480,13 @@ students.
    1. _{explain how to simulate a missing/corrupted file, and the expected behavior}_
 
 1. _{ more test cases …​ }_
+
+### Setting the course
+
+1. Setting a course 
+
+   1. Test case: `setcrs CS2103`<br>
+      Enter setcrs followed by a whitespace, followed by a course code in the format `XXYYYYZ`, where `X` and `Z` can be any letter
+      in upper or lower case, `YYYY` can be any 4 digit number and `Z` is optional.
+      Expected: The main window's title is set as the course code provided
+