add useWindowDimensions hook

src/hooks/useWindowDimensions.ts

@@ -0,0 +1,26 @@
+import { useState, useEffect } from 'react';
+
+//https://stackoverflow.com/questions/36862334/get-viewport-window-height-in-reactjs
+
+function getWindowDimensions() {
+  const { innerWidth: width, innerHeight: height } = window;
+  return {
+    width,
+    height
+  };
+}
+
+export default function useWindowDimensions() {
+  const [windowDimensions, setWindowDimensions] = useState(getWindowDimensions());
+
+  useEffect(() => {
+    function handleResize() {
+      setWindowDimensions(getWindowDimensions());
+    }
+
+    window.addEventListener('resize', handleResize);
+    return () => window.removeEventListener('resize', handleResize);
+  }, []);
+
+  return windowDimensions;
+}