docs(modal): add lazy loading usage

core/src/components/modal/readme.md

@@ -53,6 +53,36 @@ modalController.dismiss({
 })
 ```
 
+### Lazy Loading
+
+When lazy loading a modal, it's important to note that the modal will not be loaded when it is opened, but rather when the module that imports the modal's module is loaded.
+
+For example, say there exists a `CalendarComponent` and an `EventModal`. The modal is presented by clicking a button in the `CalendarComponent`. In Angular, the `EventModalModule` would need to be included in the `CalendarComponentModule` since the modal is created in the `CalendarComponent`:
+
+```typescript
+import { NgModule } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { IonicModule } from '@ionic/angular';
+
+import { CalendarComponent } from './calendar.component';
+import { EventModalModule } from '../modals/event/event.module';
+
+@NgModule({
+    declarations: [
+        CalendarComponent
+    ],
+    imports: [
+      IonicModule,
+      CommonModule,
+      EventModalModule
+    ],
+    exports: [
+      CalendarComponent
+    ]
+})
+
+export class CalendarComponentModule {}
+```
 
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