added abp-button-toolbar tag helper

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Button/AbpButtonToolbarTagHelper.cs

@@ -0,0 +1,11 @@
+namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Button
+{
+    public class AbpButtonToolbarTagHelper : AbpTagHelper<AbpButtonToolbarTagHelper, AbpButtonToolbarTagHelperService>
+    {
+        public AbpButtonToolbarTagHelper(AbpButtonToolbarTagHelperService tagHelperService)
+            : base(tagHelperService)
+        {
+
+        }
+    }
+}

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Button/AbpButtonToolbarTagHelperService.cs

@@ -0,0 +1,14 @@
+using Microsoft.AspNetCore.Razor.TagHelpers;
+using Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.Microsoft.AspNetCore.Razor.TagHelpers;
+
+namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Button
+{
+    public class AbpButtonToolbarTagHelperService : AbpTagHelperService<AbpButtonToolbarTagHelper>
+    {
+        public override void Process(TagHelperContext context, TagHelperOutput output)
+        {
+            output.Attributes.AddClass("btn-toolbar");
+            output.Attributes.Add("role","toolbar");
+        }
+    }
+}