feat(plugin): add Document Viewer plugin (#1520)

* typo(barcode-scanner): fixe circle lint error

* typo(docs):  Unified the documentations

In some plugins the typescript markup was missing.
I also unified the console.log string from console.log("hello") to console.log('Hello') so any plugin page look the same.

* Initial commit

* updated interface

* updated interface

src/@ionic-native/plugins/document-viewer/index.ts

@@ -0,0 +1,93 @@
+import { Plugin, Cordova, IonicNativePlugin } from '@ionic-native/core';
+import { Injectable } from '@angular/core';
+
+export interface DocumentViewerOptions {
+  title: string;
+  documentView: {
+    closeLabel: string;
+  };
+  navigationView: {
+    closeLabel: string;
+  };
+  email: {
+    enabled: boolean;
+  };
+  print: {
+    enabled: boolean;
+  };
+  openWith: {
+    enabled: boolean;
+  };
+  bookmarks: {
+    enabled: boolean;
+  };
+  search: {
+    enabled: boolean;
+  };
+  autoClose: {
+    onPause: boolean;
+  };
+};
+
+/**
+ * @name Document Viewer
+ * @description
+ * This plugin offers a slim API to view PDF files which are either stored in the apps assets folder (/www/*) or in any other file system directory available via the cordova file plugin.
+ *
+ * @usage
+ * ```typescript
+ * import { DocumentViewer } from '@ionic-native/document-viewer';
+ *
+ *
+ * constructor(private document: DocumentViewer) { }
+ *
+ * ...
+ * const options = {
+ *   title: 'My PDF'
+ * }
+ * this.document.view('assets/myFile.pdf', 'application/pdf', options)
+ *
+ * ```
+ *
+ * @interfaces
+ * DocumentViewerOptions
+ */
+@Plugin({
+  pluginName: 'Document Viewer',
+  plugin: 'cordova-plugin-document-viewer',
+  pluginRef: 'SitewaertsDocumentViewer',
+  repo: 'DocumentViewer',
+  platforms: ['Android', 'iOS', 'Windows']
+})
+@Injectable()
+export class DocumentViewer extends IonicNativePlugin {
+
+  /**
+   * Displays the email composer pre-filled with data.
+   *
+   * @returns {Promise<any>} Resolves promise when the EmailComposer has been opened
+   */
+  @Cordova()
+  getSupportInfo(): Promise<any> { return; }
+
+  /**
+   * Check if the document can be shown
+   *
+   * @param url {string} Url to the file
+   * @param contentType {string} Content type of the file
+   * @param options {Array<DocumentViewerOptions>} options
+   */
+  @Cordova({ sync: true })
+  canViewDocument(url: string, contentType: string, options: Array<DocumentViewerOptions>): void { }
+
+  /**
+   * Opens the file
+   *
+   * @param url {string} Url to the file
+   * @param contentType {string} Content type of the file
+   * @param options {Array<DocumentViewerOptions>} options
+   */
+  @Cordova({ sync: true })
+  viewDocument(url: string, contentType: string, options: Array<DocumentViewerOptions>): void { }
+
+}