Added score filter functionality

fixes #418

Describe the changes you've made

I have added a filter functionality which will sort the user`s on the basis of their score in ascending and descending order.

Describe if there is any unusual behavior (Any Warning) of your code(Write NA if there isn't)

Additional context (OPTIONAL)

Test plan (OPTIONAL)

A good test plan should give instructions that someone else can easily follow.

Checklist

[x ] My code follows the code style of this project.
[x ] My change requires a change to the documentation.
[x ] I have updated the documentation accordingly.
[x ] All new and existing tests passed.
[x ] The title of my pull request is a short description of the requested changes.

Provide a Deployed link of route/page that needs to review

codeforcauseorg / edu-client