feat(challenge): add a pipe challenge serie

apps/pipe-easy/src/app/app.component.ts

@@ -0,0 +1,21 @@
+import { NgFor } from '@angular/common';
+import { Component } from '@angular/core';
+
+@Component({
+  standalone: true,
+  imports: [NgFor],
+  selector: 'app-root',
+  template: `
+    <div *ngFor="let person of persons; let index = index">
+      {{ heavyComputation(person, index) }}
+    </div>
+  `,
+})
+export class AppComponent {
+  persons = ['toto', 'jack'];
+
+  heavyComputation(name: string, index: number) {
+    // very heavy computation
+    return `${name} - ${index}`;
+  }
+}