Feature: Added the customer module to list / edit customers. This is needed to add the customer discount functionality

bookie/src/app/customers/customer-list/customer-list-datasource.ts

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+import { DataSource } from '@angular/cdk/collections';
+import { Observable, of as observableOf } from 'rxjs';
+
+import { Customer } from '../../core/customer';
+
+export class CustomerListDatasource extends DataSource<Customer> {
+  constructor(public data: Customer[]) {
+    super();
+  }
+
+  connect(): Observable<Customer[]> {
+    return observableOf(this.data);
+  }
+
+  disconnect() {}
+}

bookie/src/app/customers/customer-list/customer-list.component.html

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+<mat-card>
+  <mat-card-title-group>
+    <mat-card-title>Customers</mat-card-title>
+    <a mat-button [routerLink]="['/customers', 'new']">
+      <mat-icon>add_box</mat-icon>
+      Add
+    </a>
+  </mat-card-title-group>
+  <mat-card-content>
+    <mat-table #table [dataSource]="dataSource" aria-label="Elements">
+      <!-- Name Column -->
+      <ng-container matColumnDef="name">
+        <mat-header-cell *matHeaderCellDef>Name</mat-header-cell>
+        <mat-cell *matCellDef="let row"
+          ><a [routerLink]="['/customers', row.id]">{{ row.name }}</a></mat-cell
+        >
+      </ng-container>
+
+      <!-- Phone Column -->
+      <ng-container matColumnDef="phone">
+        <mat-header-cell *matHeaderCellDef>Phone</mat-header-cell>
+        <mat-cell *matCellDef="let row">{{ row.phone }}</mat-cell>
+      </ng-container>
+
+      <!-- Address Column -->
+      <ng-container matColumnDef="address">
+        <mat-header-cell *matHeaderCellDef>Address</mat-header-cell>
+        <mat-cell *matCellDef="let row">{{ row.address }}</mat-cell>
+      </ng-container>
+
+      <mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
+      <mat-row *matRowDef="let row; columns: displayedColumns"></mat-row>
+    </mat-table>
+  </mat-card-content>
+</mat-card>

bookie/src/app/customers/customer-list/customer-list.component.ts

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+import { Component, OnInit } from '@angular/core';
+import { ActivatedRoute } from '@angular/router';
+
+import { Customer } from '../../core/customer';
+
+import { CustomerListDatasource } from './customer-list-datasource';
+
+@Component({
+  selector: 'app-customer-list',
+  templateUrl: './customer-list.component.html',
+  styleUrls: ['./customer-list.component.css'],
+})
+export class CustomerListComponent implements OnInit {
+  dataSource: CustomerListDatasource = new CustomerListDatasource([]);
+  list: Customer[] = [];
+  /** Columns displayed in the table. Columns IDs can be added, removed, or reordered. */
+  displayedColumns = ['name', 'phone', 'address'];
+
+  constructor(private route: ActivatedRoute) {}
+
+  ngOnInit() {
+    this.route.data.subscribe((value) => {
+      const data = value as { list: Customer[] };
+      this.list = data.list;
+    });
+    this.dataSource = new CustomerListDatasource(this.list);
+  }
+}