add copy button

components/CopyButton.js

@@ -0,0 +1,18 @@
+import React from 'react'
+
+// constants
+const STATUS = {
+  IDLE: 'IDLE',
+  LOADING: 'LOADING',
+  DEBOUNCED: 'DEBOUNCED'
+}
+
+class CopyButton extends React.Component {
+  constructor(props) {
+    super(props)
+
+    this.state = {
+      status: STATUS.IDLE
+    }
+  }
+}