Update the implementation of add feature in DeveloperGuide.md

docs/DeveloperGuide.md

@@ -160,16 +160,36 @@ This section describes some noteworthy details on how certain features are imple
 ### Add Feature
 #### Implementation details 
 
-The `add` feature allows user to add up to five different details of a person, including the name, role,
-contact details, the course he is taking, as well as the respective tutorial classes.
+The `add` feature allows user to add up to five different details of a person, including the name, role the person,
+contact details, the course the person is taking, as well as the respective tutorial classes.
 
 #### Implementation:
 
 - When adding a profile, the only compulsory field that user has to include is the `name` field. 
 - All the other fields `role`, `contact` and `course` are optional.
+- The fields can be added in any order. 
 - Users can have more than one input for each of the optional field.
 - When adding a `course`, users can also choose to include or not to include the tutorial classes of the course.
 
+#### Design Considerations
+<ol>
+    <li>
+        <b>User Expectations:</b> 
+        <md>
+            Users have a common expectation that their favorite persons should be identifiable in the UI. Hence, a role
+            tag is being added for different roles. 
+        </md>
+    </li>
+    <li>
+        <b>Ease of Use: </b>
+        <md>
+            Having only one compulsory field when adding a person makes it faster and easier for users to add someone
+            into the list, instead of having to type include every single field, some of which might be unknown to the
+            users. 
+        </md>
+    </li>
+</ol>
+
 ### List Feature 
 #### Implementation details