users screen + userCard component

src/components/user-card/user-card.tsx

@@ -0,0 +1,47 @@
+import React from 'react'
+import { sha256 } from 'js-sha256'
+
+import { User } from '../../__data__/model'
+
+import { AddMissedButton, Avatar, Wrapper } from './style'
+
+export function getGravatarURL(email, user) {
+  if (!email) return void 0
+  const address = String(email).trim().toLowerCase()
+  const hash = sha256(address)
+
+  return `https://www.gravatar.com/avatar/${hash}?d=robohash`
+}
+
+export const UserCard = ({
+  student,
+  present,
+  onAddUser,
+  wrapperAS,
+  width
+}: {
+  student: User
+  present: boolean
+  width?: string | number
+  onAddUser?: (user: User) => void
+  wrapperAS?: React.ElementType<any, keyof React.JSX.IntrinsicElements>;
+}) => {
+  return (
+    <Wrapper warn={!present} as={wrapperAS} width={width}>
+      <Avatar src={student.picture || getGravatarURL(student.email, null)} />
+      <p style={{ marginTop: 6 }}>
+        {student.name || student.preferred_username}{' '}
+      </p>
+      {onAddUser && !present && (
+        <AddMissedButton onClick={() => onAddUser(student)}>
+          add
+        </AddMissedButton>
+      )}
+    </Wrapper>
+  )
+}
+
+UserCard.defaultProps = {
+  wrapperAS: 'div',
+  onAddUser: void 0,
+}