Add manifest.json, icons and install button, flatten client/src

client/js/utils/size.js

@@ -0,0 +1,45 @@
+let width, height;
+const listeners = [];
+
+function update() {
+  width = window.innerWidth;
+  height = window.innerHeight;
+
+  for (let i = 0; i < listeners.length; i++) {
+    listeners[i](width, height);
+  }
+}
+
+let resizeRAF;
+
+function resize() {
+  if (resizeRAF) {
+    window.cancelAnimationFrame(resizeRAF);
+  }
+  resizeRAF = window.requestAnimationFrame(update);
+}
+
+update();
+window.addEventListener('resize', resize);
+
+export function windowWidth() {
+  return width;
+}
+
+export function windowHeight() {
+  return height;
+}
+
+export function addResizeListener(f, init) {
+  listeners.push(f);
+  if (init) {
+    f(width, height);
+  }
+}
+
+export function removeResizeListener(f) {
+  const i = listeners.indexOf(f);
+  if (i > -1) {
+    listeners.splice(i, 1);
+  }
+}