Update the AboutUs.md file and include new images

The AboutUs.md file allows users to find out more
about the developers.

Updating the AboutUs.md file allows us to delegate
group work more efficiently.

docs/AboutUs.md

@@ -48,12 +48,12 @@ You can reach us at the email `seer[at]comp.nus.edu.sg`
 * Role: Developer
 * Responsibilities: Dev Ops + Threading
 
-### James Doe
+### Dexter Wong
 
-<img src="images/johndoe.png" width="200px">
+<img src="images/dexter.png" width="200px">
 
-[[github](http://github.com/johndoe)]
-[[portfolio](team/johndoe.md)]
+[[github](http://github.com/Dexter-Wong)]
+[[portfolio](team/dexter.md)]
 
 * Role: Developer
 * Responsibilities: UI

docs/team/dexter.md

@@ -0,0 +1,46 @@
+---
+layout: page
+title: John Doe's Project Portfolio Page
+---
+
+### Project: AddressBook Level 3
+
+AddressBook - Level 3 is a desktop address book application used for teaching Software Engineering principles. The user interacts with it using a CLI, and it has a GUI created with JavaFX. It is written in Java, and has about 10 kLoC.
+
+Given below are my contributions to the project.
+
+* **New Feature**: Added the ability to undo/redo previous commands.
+  * What it does: allows the user to undo all previous commands one at a time. Preceding undo commands can be reversed by using the redo command.
+  * Justification: This feature improves the product significantly because a user can make mistakes in commands and the app should provide a convenient way to rectify them.
+  * Highlights: This enhancement affects existing commands and commands to be added in future. It required an in-depth analysis of design alternatives. The implementation too was challenging as it required changes to existing commands.
+  * Credits: *{mention here if you reused any code/ideas from elsewhere or if a third-party library is heavily used in the feature so that a reader can make a more accurate judgement of how much effort went into the feature}*
+
+* **New Feature**: Added a history command that allows the user to navigate to previous commands using up/down keys.
+
+* **Code contributed**: [RepoSense link]()
+
+* **Project management**:
+  * Managed releases `v1.3` - `v1.5rc` (3 releases) on GitHub
+
+* **Enhancements to existing features**:
+  * Updated the GUI color scheme (Pull requests [\#33](), [\#34]())
+  * Wrote additional tests for existing features to increase coverage from 88% to 92% (Pull requests [\#36](), [\#38]())
+
+* **Documentation**:
+  * User Guide:
+    * Added documentation for the features `delete` and `find` [\#72]()
+    * Did cosmetic tweaks to existing documentation of features `clear`, `exit`: [\#74]()
+  * Developer Guide:
+    * Added implementation details of the `delete` feature.
+
+* **Community**:
+  * PRs reviewed (with non-trivial review comments): [\#12](), [\#32](), [\#19](), [\#42]()
+  * Contributed to forum discussions (examples: [1](), [2](), [3](), [4]())
+  * Reported bugs and suggestions for other teams in the class (examples: [1](), [2](), [3]())
+  * Some parts of the history feature I added was adopted by several other class mates ([1](), [2]())
+
+* **Tools**:
+  * Integrated a third party library (Natty) to the project ([\#42]())
+  * Integrated a new Github plugin (CircleCI) to the team repo
+
+* _{you can add/remove categories in the list above}_