docs(demos): add Alert API demos

references #5311

demos/alert/app.html

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+<ion-nav [root]="rootPage"></ion-nav>

demos/alert/index.ts

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+import {App, Page, Alert, NavController} from 'ionic/ionic';
+
+
+@App({
+  templateUrl: 'app.html'
+})
+class ApiDemoApp {
+  constructor() {
+    this.rootPage = InitialPage;
+  }
+}
+
+
+@Page({
+  templateUrl: 'main.html'
+})
+export class InitialPage {
+  constructor(nav: NavController) {
+    this.nav = nav;
+  }
+
+  doAlert() {
+    let alert = Alert.create({
+      title: 'New Friend!',
+      subTitle: 'Your friend, Obi wan Kenobi, just accepted your friend request!',
+      buttons: ['Ok']
+    });
+
+    this.nav.present(alert);
+  }
+
+  doConfirm() {
+    let alert = Alert.create({
+      title: 'Use this lightsaber?',
+      body: 'Do you agree to use this lightsaber to do good across the intergalactic galaxy?',
+      buttons: [
+        {
+          text: 'Disagree',
+          handler: () => {
+            console.log('Disagree clicked');
+          }
+        },
+        {
+          text: 'Agree',
+          handler: () => {
+            console.log('Agree clicked');
+          }
+        }
+      ]
+    });
+
+    this.nav.present(alert);
+  }
+
+  doPrompt() {
+    let alert = Alert.create({
+      title: 'Login',
+      body: "Enter a name for this new album you're so keen on adding",
+      inputs: [
+        {
+          name: 'title',
+          placeholder: 'Title'
+        },
+      ],
+      buttons: [
+        {
+          text: 'Cancel',
+          handler: data => {
+            console.log('Cancel clicked');
+          }
+        },
+        {
+          text: 'Save',
+          handler: data => {
+            console.log('Saved clicked');
+          }
+        }
+      ]
+    });
+
+    this.nav.present(alert);
+  }
+
+  doRadio() {
+    let alert = Alert.create();
+    alert.setTitle('Lightsaber color');
+
+    alert.addInput({
+      type: 'radio',
+      label: 'Blue',
+      value: 'blue',
+      checked: true
+    });
+
+    alert.addInput({
+      type: 'radio',
+      label: 'Green',
+      value: 'green'
+    });
+
+    alert.addInput({
+      type: 'radio',
+      label: 'Red',
+      value: 'red'
+    });
+
+    alert.addInput({
+      type: 'radio',
+      label: 'Yellow',
+      value: 'yellow'
+    });
+
+    alert.addInput({
+      type: 'radio',
+      label: 'Purple',
+      value: 'purple'
+    });
+
+    alert.addInput({
+      type: 'radio',
+      label: 'White',
+      value: 'white'
+    });
+
+    alert.addInput({
+      type: 'radio',
+      label: 'Black',
+      value: 'black'
+    });
+
+    alert.addButton('Cancel');
+    alert.addButton({
+      text: 'Ok',
+      handler: data => {
+        console.log('Radio data:', data);
+        this.testRadioOpen = false;
+        this.testRadioResult = data;
+      }
+    });
+
+    this.nav.present(alert);
+  }
+
+  doCheckbox() {
+    let alert = Alert.create();
+    alert.setTitle('Which planets have you visited?');
+
+    alert.addInput({
+        type: 'checkbox',
+        label: 'Alderaan',
+        value: 'value1',
+        checked: true
+    });
+
+    alert.addInput({
+        type: 'checkbox',
+        label: 'Bespin',
+        value: 'value2'
+    });
+
+    alert.addInput({
+        type: 'checkbox',
+        label: 'Coruscant',
+        value: 'value3'
+    });
+
+    alert.addInput({
+        type: 'checkbox',
+        label: 'Endor',
+        value: 'value4'
+    });
+
+    alert.addInput({
+        type: 'checkbox',
+        label: 'Hoth',
+        value: 'value5'
+    });
+
+    alert.addInput({
+        type: 'checkbox',
+        label: 'Jakku',
+        value: 'value6'
+    });
+
+    alert.addInput({
+        type: 'checkbox',
+        label: 'Naboo',
+        value: 'value6'
+    });
+
+    alert.addInput({
+        type: 'checkbox',
+        label: 'Takodana',
+        value: 'value6'
+    });
+
+    alert.addInput({
+        type: 'checkbox',
+        label: 'Tatooine',
+        value: 'value6'
+    });
+
+    alert.addButton('Cancel');
+    alert.addButton({
+      text: 'Okay',
+      handler: data => {
+          console.log('Checkbox data:', data);
+          this.testCheckboxOpen = false;
+          this.testCheckboxResult = data;
+      }
+    });
+
+    this.nav.present(alert);
+  }
+
+  doCustomAnimation() {
+
+  }
+
+}

demos/alert/main.html

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+<ion-navbar *navbar>
+  <ion-title>Alert</ion-title>
+</ion-navbar>
+
+<ion-content>
+  <button block (click)="doAlert()">Basic Alert</button>
+  <button light block (click)="doConfirm()">Confirm Alert</button>
+  <button secondary block (click)="doPrompt()">Prompt Alert</button>
+  <button danger block (click)="doRadio()">Radio Alert</button>
+  <button dark block (click)="doCheckbox()">Checkbox Alert</button>
+  <button block (click)="doCustomAnimation()">Custom Animation Alert</button>
+</ion-content>