feat: adição do arquivo CustomHeader.razor

Author: danieldantasdev

developments/BlazorComponent/BlazorComponent/Components/Pages/Headers/CustomHeader.razor

@@ -0,0 +1,19 @@
+@if (ChildContent is null)
+{
+    <div class="alert alert-info" role="alert">
+        Cabeçalho não definido!
+    </div>
+}
+else
+{
+    <div class="alert alert-info" role="alert">
+        @ChildContent
+    </div>
+}
+
+@code {
+
+    [Parameter]
+    public RenderFragment? ChildContent { get; set; }
+
+}