ADD : création of the inventory page

myBlazorApp/myBlazorApp/Pages/Inventory.razor

@@ -0,0 +1,6 @@
+@page "/inventory"
+
+<h3>Inventory</h3>
+
+
+

myBlazorApp/myBlazorApp/Pages/Inventory.razor.cs

@@ -0,0 +1,8 @@
+using System;
+namespace myBlazorApp.Pages
+{
+	public partial class Inventory
+	{
+	}
+}
+

myBlazorApp/myBlazorApp/Shared/NavMenu.razor

@@ -11,7 +11,12 @@
     <nav class="flex-column">
         <div class="nav-item px-3">
             <NavLink class="nav-link" href="list">
-                <span class="oi oi-list-rich"/> List
+                <span class="oi oi-list-rich" /> List
+            </NavLink>
+        </div>
+        <div class="nav-item px-3">
+            <NavLink class="nav-link" href="inventory">
+                <span class="oi oi-list-rich" /> Inventory
             </NavLink>
         </div>
         <div class="nav-item px-3">