Update nixonwidjaja.md

docs/team/nixonwidjaja.md

@@ -9,16 +9,33 @@ HR Insight is a desktop app for HR people, optimized for use via a Line Interfac
 
 Given below are my contributions to the project.
 
-- **New Feature**: to be added soon
-
-- **Code contributed**: to be added soon
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-- **Project management**: to be added soon
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-- **Enhancements to existing features**: to be added soon
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-- **Documentation**: to be added soon
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-- **Community**: to be added soon
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-- **Tools**: to be added soon
+- **New Feature**: Undo and redo command
+  * What it does: Allows users to undo previous commands and reverse the undo commands with redo command. (PR [#85](https://github.com/AY2324S1-CS2103-F13-2/tp/pull/85))
+  * Justification: This feature improves the app significantly because users can conveniently undo any mistakes in command, so any errors can be fixed quickly.
+  * Highlights: The design to implement undo and redo commands is challenging and fun to think about.
+
+- **New Feature**: Leave command and employee's leave attribute
+  * What it does: Allows employees to have a leave attribute that records which months they are on leave, and for users to edit those leaves using the leave command. (PR [#62](https://github.com/AY2324S1-CS2103-F13-2/tp/pull/62))
+  * Justification: HR people should be able to view and edit the leave records of all employees in the company.
+
+- **New Feature**: Sort command
+  * What it does: Allows users to sort the employee list based on given parameter, e.g., sort based on name, sort salary in descending order, etc. (PR [#108](https://github.com/AY2324S1-CS2103-F13-2/tp/pull/108))
+  * Justification: This features mimics real employee lists/tables that enable HR people to sort based on certain criteria, so they can get more insights from the employee data.
+  * Highlights: Learned a lot from implementing custom comparator in Java to enable list sorting.
+
+- **New Feature**: Navigate through previous commands using up/down keys
+  * What it does: Allows users to navigate through their previous inputs conveniently using up/down keys on the keyboard. (PR [#126](https://github.com/AY2324S1-CS2103-F13-2/tp/pull/126))
+  * Justification: This features improves user experience significantly because it mimics real computer CLI/terminal behavior.
+
+- **Code contributed**: [RepoSense link](https://nus-cs2103-ay2324s1.github.io/tp-dashboard/?search=nixonwidjaja&breakdown=true)
+
+- **Enhancements to existing features**:
+  * Adapted `add`, `edit`, and `list` commands to work based on HR Insight needs. (PR [#26](https://github.com/AY2324S1-CS2103-F13-2/tp/pull/26))
+
+- **Documentation**:
+  * User Guide and Developer Guide: Added documentations for `undo`, `redo`, `leave`, `sort` commands.
+
+- **Community**:
+  * Reviewed PRs and gave non-trivial suggestions to improve code quality. ([#61](https://github.com/AY2324S1-CS2103-F13-2/tp/issues/61), [#74](https://github.com/AY2324S1-CS2103-F13-2/tp/issues/74), [#117](https://github.com/AY2324S1-CS2103-F13-2/tp/pull/117))
+  * Reported and fixed critical bugs. (PR [#75](https://github.com/AY2324S1-CS2103-F13-2/tp/pull/75), [#110](https://github.com/AY2324S1-CS2103-F13-2/tp/pull/110), [#136](https://github.com/AY2324S1-CS2103-F13-2/tp/pull/136))
+  * Set up the organization, repo, and Codecov for the team.