Feature: Voucher tags. This will eventually help in filtering ledger based on tags and also to group vouchers.

overlord/src/app/purchase/purchase.module.ts

@@ -7,6 +7,7 @@ import { MatAutocompleteModule } from '@angular/material/autocomplete';
 import { MatButtonModule } from '@angular/material/button';
 import { MatCardModule } from '@angular/material/card';
 import { MatCheckboxModule } from '@angular/material/checkbox';
+import { MatChipsModule } from '@angular/material/chips';
 import { DateAdapter, MAT_DATE_FORMATS, MAT_DATE_LOCALE, MatNativeDateModule } from '@angular/material/core';
 import { MatDatepickerModule } from '@angular/material/datepicker';
 import { MatDialogModule } from '@angular/material/dialog';
@@ -49,6 +50,7 @@ export const MY_FORMATS = {
     MatButtonModule,
     MatCardModule,
     MatCheckboxModule,
+    MatChipsModule,
     MatDatepickerModule,
     MatDialogModule,
     MatFormFieldModule,