Added Presentation API demo

Author: LostBeard

SpawnDev.BlazorJS.Demo/Layout/NavMenu.razor

@@ -14,6 +14,11 @@
                 <span class="bi bi-house-door-fill-nav-menu" aria-hidden="true"></span> Home
             </NavLink>
         </div>
+        <div class="nav-item px-3">
+            <NavLink class="nav-link" href="presentation">
+                <span class="bi bi-display-fill" aria-hidden="true"></span> Presentation API
+            </NavLink>
+        </div>
     </nav>
 </div>