adding a few filters (no doing anything yet)

pdb-js/src/app/app.module.ts

@@ -1,12 +1,17 @@
 import { BrowserModule } from '@angular/platform-browser';
+import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
 import { NgModule } from '@angular/core';
+import { HttpClientModule } from '@angular/common/http';
 
 import { AppRoutingModule } from './app-routing.module';
 import { AppComponent } from './app.component';
 import { MainPageComponent } from './main-page/main-page.component';
 import { HelpPageComponent } from './help-page/help-page.component';
 import { UploadPageComponent } from './upload-page/upload-page.component';
-//import { VisualizationPageComponent } from './visualization-page/visualization-page.component';
+import { VisualizationPageComponent } from './visualization-page/visualization-page.component';
+ 
+import {MatSelectModule} from '@angular/material/select';
+import {MatFormFieldModule, MatInputModule} from '@angular/material';
 
 @NgModule({
   declarations: [
@@ -14,11 +19,14 @@ import { UploadPageComponent } from './upload-page/upload-page.component';
     MainPageComponent,
     HelpPageComponent,
     UploadPageComponent,
-    //VisualizationPageComponent,
+    VisualizationPageComponent,
   ],
   imports: [
     BrowserModule,
-    AppRoutingModule
+    AppRoutingModule,
+    MatSelectModule,MatFormFieldModule, MatInputModule,
+    BrowserAnimationsModule,
+    HttpClientModule
   ],
   providers: [],
   bootstrap: [AppComponent]