Added email templating, and user welcome email

server/emails/components/Button.js

@@ -0,0 +1,17 @@
+// @flow
+import React from 'react';
+
+export default (props: { href: string, children: React.Element<*> }) => {
+  const style = {
+    display: 'inline-block',
+    padding: '10px 20px',
+    color: '#FFFFFF',
+    background: '#000000',
+    borderRadius: '4px',
+    fontWeight: 500,
+    textDecoration: 'none',
+    cursor: 'pointer',
+  };
+
+  return <a {...props} style={style} />;
+};