feat: added icon button

Author: Anlanther

src/app/components/color-showcase/color-showcase.component.html

@@ -1,3 +1,6 @@
 <button mat-flat-button class="primary">Default Primary</button>
 <button mat-flat-button class="secondary">Default Secondary</button>
 <button mat-flat-button class="accent">Default Accent</button>
+<button mat-icon-button class="icon-button">
+  <mat-icon>more_vert</mat-icon>
+</button>

src/app/components/color-showcase/color-showcase.component.scss

@@ -16,6 +16,14 @@
   );
 }
 
+.icon-button {
+  @include mat.icon-button-overrides(
+    (
+      icon-size: 2px,
+    )
+  );
+}
+
 .primary {
   @include button-color("primary");
 }