Feat: Mocked the admin add user account

[mutuajoseph]

To view, the changes navigate to the /app/users.

Features worked on:

1. pagination
2. Filtering of users within the table
3. Section to add users though still unclear regarding the wireframe created (No section to choose the role to add).

[github-actions]

Visit the preview URL for this PR (updated for commit 7304812):

https://moringa-library--pr69-mutuajoseph-admin-ad-l1q6ghhd.web.app

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[otsembo]

@karume629 Once you finish consulting with SIlas on the matter ensure you ping your whole team so that they can continue with their portions.