Add block-sync to application.

src/app/_models/index.ts

@@ -1 +1,2 @@
 export * from './transaction';
+export * from './settings';

src/app/_models/settings.ts

@@ -0,0 +1,18 @@
+export class Settings {
+  w3: W3 = {
+    engine: undefined,
+    provider: undefined,
+  };
+  scanFilter: any;
+  registry: any;
+  txHelper: any;
+
+  constructor(scanFilter: any) {
+    this.scanFilter = scanFilter;
+  }
+}
+
+export class W3 {
+  engine: any;
+  provider: any;
+}