Add ethereum icon type (#391)

packages/react-identicon/src/icons/Ethereum.tsx

@@ -0,0 +1,29 @@
+// Copyright 2017-2020 @polkadot/react-identicon authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import { Props } from '../types';
+
+import makeBlockie from 'ethereum-blockies-base64';
+import React, { useMemo } from 'react';
+import styled from 'styled-components';
+
+function Ethereum ({ address, className = '', style }: Props): React.ReactElement<Props> {
+  const imgSrc = useMemo(
+    () => makeBlockie(address),
+    [address]
+  );
+
+  return (
+    <img
+      className={className}
+      src={imgSrc}
+      style={style}
+    />
+  );
+}
+
+export default React.memo(styled(Ethereum)(({ size }: Props) => `
+  display: block;
+  height: ${size}px;
+  width: ${size}px;
+`));