docs(demos/scroll): api demo

demos/scroll/index.ts

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+import {App} from 'ionic/ionic';
+
+@App({
+  templateUrl: 'main.html'
+})
+
+class DemoApp {
+  blur() {
+  }
+}

demos/scroll/main.html

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+<ion-navbar *navbar>
+
+  <ion-title>
+    Scroll
+  </ion-title>
+
+</ion-navbar>
+
+<ion-content>
+
+  <ion-scroll scroll-x="true" scroll-y="true" style="width: 100%; height: 100%">
+      <div style="width: 3460px; height: 3008px; background: url('https://upload.wikimedia.org/wikipedia/commons/3/32/Paris_7th_arrondissement_map_with_listings.png') repeat"></div>
+  </ion-scroll>
+
+</ion-content>
+