RC-7: create custom hook useWindowDimensions

src/app/hooks/index.js

@@ -0,0 +1,20 @@
+import { useState, useEffect } from 'react';
+
+export function useWindowDimensions() {
+  const getWindowDimensions = () => {
+    const { innerWidth: width, innerHeight: height } = window;
+
+    return { width, height };
+  };
+  const [windowDimensions, setWindowDimensions] = useState(getWindowDimensions());
+
+  useEffect(() => {
+    const onRecize = () => setWindowDimensions(getWindowDimensions());
+
+    window.addEventListener('resize', onRecize);
+
+    return () => window.removeEventListener('resize', onRecize);
+  }, []);
+
+  return windowDimensions;
+}