fix(preloader): missed file

src/app/theme/services/baImageLoader/BaImageLoader.service.ts

@@ -0,0 +1,16 @@
+import {Injectable} from '@angular/core';
+
+@Injectable()
+export class BaImageLoaderService {
+
+  public load(src):Promise<any> {
+
+    return new Promise((resolve, reject) => {
+      let img = new Image();
+      img.src = src;
+      img.onload = function(){
+        resolve('Image with src ' + src + ' loaded successfully.');
+      };
+    });
+  }
+}