Create CommentComponent

[yeppog]

Create the CommentComponent.

Refer to the schema:

export interface Comment {
  comments: Comment[];
  body: string;
  edited: boolean;
  username: string;
  avatarPath: string;
  createdAt: Date;
}

The component should take in the above props, and map it into a format similar to the post component. Refer to the illustration:

The reply button should open an input field for the user to reply to the comment.
The like button should not do anything for now.

Afterwards, update PostPageComponent to take in the new mapping for comments.