Frontend/backend project structure

+ Base implementation of a differential synchronization based on Neil
  Fraser article/talk

See https://www.youtube.com/watch?v=S2Hp_1jqpY8

client/src/style/index.css

@@ -0,0 +1,10 @@
+#app {
+    display: inherit;
+}
+
+@media print
+{    
+    .noPrint, .noPrint * {
+        display: none !important;
+    }
+}

client/src/style/index.css.d.ts

@@ -0,0 +1,13 @@
+declare namespace IndexCssModule {
+  export interface IIndexCss {
+    app: string;
+    noPrint: string;
+  }
+}
+
+declare const IndexCssModule: IndexCssModule.IIndexCss & {
+  /** WARNING: Only available when `css-loader` is used without `style-loader` or `mini-css-extract-plugin` */
+  locals: IndexCssModule.IIndexCss;
+};
+
+export = IndexCssModule;