add diagram component

web/src/app/components/diagram/diagram.component.html

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+<p>diagram works!</p>

web/src/app/components/diagram/diagram.component.spec.ts

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+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { DiagramComponent } from './diagram.component';
+
+describe('DiagramComponent', () => {
+  let component: DiagramComponent;
+  let fixture: ComponentFixture<DiagramComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [DiagramComponent]
+    })
+    .compileComponents();
+
+    fixture = TestBed.createComponent(DiagramComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

web/src/app/components/diagram/diagram.component.ts

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+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'app-diagram',
+  imports: [],
+  templateUrl: './diagram.component.html',
+  styleUrl: './diagram.component.scss'
+})
+export class DiagramComponent {
+
+}