Add avatar component

__tests__/Avatar.test.tsx

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+describe('Avatar test suite', () => {});

src/components/Avatar/index.tsx

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+import { Wrapper } from './styles';
+
+const Avatar = () => {
+  return <Wrapper></Wrapper>;
+};
+
+export default Avatar;

src/components/Avatar/styles.ts

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+import styled from 'styled-components';
+
+export const Wrapper = styled.div``;