[ feature ] users 컴포넌트 구현

### ISSUE
- Group: `client`
- Type: `feature`
- Detail: 레이아웃 구현

### TODO
1. [ ] users 레이아웃, css구현
2. [ ] user 레이아우스 css 구현

### Estimated time
> Pick one

### `1h`

### Labels
- Estimated time: `E: 1h`
- Group : `client`
- Sprint: `Sprint__2__`
- Urgency: `Middle`

Start by locating the client-side users and user components, then inspect nearby layout and CSS patterns. Implement the users and user layouts with their styles; done means both TODO items are complete and the resulting layouts match the existing client structure.

索引モデルが issue の本文から書いたものです。