Merge pull request #21 from Lin-Shuang-Shuang/branch-Update-DG

docs/DeveloperGuide.md

@@ -317,11 +317,14 @@ Priorities: High (must have) - `* * *`, Medium (nice to have) - `* *`, Low (unli
 
 ### Non-Functional Requirements
 
-1.  Should work on any _mainstream OS_ as long as it has Java `11` or above installed.
-2.  Should be able to hold up to 1000 persons without a noticeable sluggishness in performance for typical usage.
-3.  A user with above average typing speed for regular English text (i.e. not code, not system admin commands) should be able to accomplish most of the tasks faster using commands than using the mouse.
-
-*{More to be added}*
+* Should work on any _mainstream OS_ as long as it has Java `11` or above installed.
+* Should be able to hold up to 1000 projects without a noticeable sluggishness in performance for typical usage. 
+* Should be able to hold up to 1000 tasks per project without a noticeable sluggishness in performance for typical usage.
+* A user with above average typing speed for regular English text (i.e. not code, not system admin commands) should be able to accomplish most of the tasks faster using commands than using the mouse.
+* Should respond to user commands within 2 seconds.
+* Should be usable by a novice who has never used DevPlan Pro before.
+* Documentation should be understandable for a novice user who has never used DevPlan Pro, or any other similar project management application.
+* The user interface should be intuitive enough for users who are not IT-savvy.
 
 ### Glossary