Big Chunk of updates on way to making the sales portion working

bookie/src/app/devices/device-list/device-list-datasource.ts

@@ -0,0 +1,17 @@
+import { DataSource} from '@angular/cdk/collections';
+import { Observable, of as observableOf} from 'rxjs';
+import { Device} from '../../core/device';
+
+export class DeviceListDataSource extends DataSource<Device> {
+
+  constructor(public data: Device[]) {
+    super();
+  }
+
+  connect(): Observable<Device[]> {
+    return observableOf(this.data);
+  }
+
+  disconnect() {
+  }
+}