added-modal tag documentation

docs/en/UI/AspNetCore/Tag-Helpers/Modals.md

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+# Modals
+
+## Introduction
+
+`abp-modal` is a main element to create a modal.
+
+Basic usage:
+
+````xml
+<abp-button button-type="Primary" data-toggle="modal" data-target="#myModal">Launch modal</abp-button>
+
+<abp-modal centered="true" size="Large" id="myModal">
+   <abp-modal-header title="Modal title"></abp-modal-header>
+   <abp-modal-body>
+       Woohoo, you're reading this text in a modal!
+   </abp-modal-body>
+   <abp-modal-footer buttons="Close"></abp-modal-footer>
+</abp-modal>
+````
+
+
+
+## Demo
+
+See the [modals demo page](https://bootstrap-taghelpers.abp.io/Components/Modals) to see it in action.
+
+## Attributes
+
+### centered
+
+A value indicates the positioning of the modal. Should be one of the following values:
+
+* `false` (default value)
+* `true`
+
+Example:
+
+````xml
+<abp-alert alert-type="Warning">
+    A simple warning  alert—check it out!
+</abp-alert>
+````
+
+### size
+
+A value indicates the size of the modal. Should be one of the following values:
+
+* `Default` (default value)
+* `Small`
+* `Large`
+* `ExtraLarge`
+
+### static
+
+A value indicates if the modal will be static. Should be one of the following values:
+
+* `false` (default value)
+* `true`
+
+### Additional content
+
+`abp-modal-footer` can have multiple buttons with alignment option.
+
+Add `@using Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Modal` to your page.
+
+Example:
+
+````xml
+<abp-button button-type="Primary" data-toggle="modal" data-target="#myModal">Launch modal</abp-button>
+
+<abp-modal centered="true" size="Large" id="myModal" static="true">
+    <abp-modal-header title="Modal title"></abp-modal-header>
+    <abp-modal-body>
+        Woohoo, you're reading this text in a modal!
+    </abp-modal-body>
+    <abp-modal-footer buttons="@(AbpModalButtons.Save|AbpModalButtons.Close)" button-alignment="Between"></abp-modal-footer>
+</abp-modal>
+````
+
+### button-alignment
+
+A value indicates the positioning of your modal footer buttons. Should be one of the following values: 
+
+* `Default` (default value)
+* `Start`
+* `Center`
+* `Around`
+* `Between`
+* `End`