Added app insights

Author: estruyf

src/controls/securityTrimmedControl/SecurityTrimmedControl.tsx

@@ -2,6 +2,7 @@ import * as React from 'react';
 import { ISecurityTrimmedControlProps, ISecurityTrimmedControlState, PermissionLevel } from '.';
 import { SPHttpClient } from '@microsoft/sp-http';
 import { SPPermission } from '@microsoft/sp-page-context';
+import * as appInsights from '../../common/appInsights';
 
 export class SecurityTrimmedControl extends React.Component<ISecurityTrimmedControlProps, ISecurityTrimmedControlState> {
   constructor(props: ISecurityTrimmedControlProps) {
@@ -10,6 +11,8 @@ export class SecurityTrimmedControl extends React.Component<ISecurityTrimmedCont
     this.state = {
       allowRender: false
     };
+
+    appInsights.track('ReactPlaceholder', {});
   }
 
   /**