add SignalR client service

app/app.component.ts

@@ -1,6 +1,19 @@
-import { Component } from '@angular/core';
+import { Component, OnInit } from '@angular/core';
+
+import { FeedService, ConnectionState } from './shared/feed.service'
+
 @Component({
     selector: 'my-app',
-    templateUrl: 'app/app.component.html'
+    templateUrl: 'app/app.component.html',
+    providers: [FeedService]
 })
-export class AppComponent { }
+export class AppComponent implements OnInit {
+
+    constructor(private service: FeedService) { }
+
+    ngOnInit() {
+        this.service.start(true).subscribe(
+            null,
+            error => console.log('Error on init: ' + error));
+    }
+}