Add filter future user story

- add filter user story

docs/DeveloperGuide.md

@@ -407,6 +407,7 @@ Priorities: High (must have) - `* * *`, Medium (nice to have) - `* *`, Low (futu
 | `*`      | Organised CS Undergraduate    | view the interview dates for different internships applications                  | I can update my schedule accordingly                                     |
 | `*`      | Efficient CS Undergraduate    | view my most desired internship applications by favouriting them                 | I can prioritize my time on checking up on these internship applications |
 | `*`      | Forgetful CS Undergraduate    | remind myself of acceptance deadline                                             | I will not miss the deadline to accept                                   |
+| `*`      | Organised CS Undergraduate    | filter internship applications by role                                           | I can find applications of certain role                                  |
 
 *{More to be added}*