add userprefs to frontend

frontend/src/app/components/pref-option/pref-option.module.ts

@@ -0,0 +1,18 @@
+import { CommonModule } from '@angular/common';
+import { NgModule } from '@angular/core';
+import { MatFormFieldModule } from '@angular/material/form-field';
+import { MatInputModule } from '@angular/material/input';
+import { MatSlideToggleModule } from '@angular/material/slide-toggle';
+import { PrefOptionComponent } from './pref-option.component';
+
+@NgModule({
+  imports: [
+    CommonModule,
+    MatFormFieldModule,
+    MatInputModule,
+    MatSlideToggleModule,
+  ],
+  declarations: [PrefOptionComponent],
+  exports: [PrefOptionComponent],
+})
+export class PrefOptionModule {}