feat: docs app

docs/app/@theme/pipes/capitalize.pipe.ts

@@ -0,0 +1,11 @@
+import { Pipe, PipeTransform } from '@angular/core';
+
+@Pipe({ name: 'ngxCapitalize' })
+export class CapitalizePipe implements PipeTransform {
+
+  transform(input: string): string {
+    return input && input.length
+      ? (input.charAt(0).toUpperCase() + input.slice(1).toLowerCase())
+      : input;
+  }
+}