Add docs for AbpLoadingDirective

docs/en/UI/Angular/Loading-Directive.md

@@ -0,0 +1,44 @@
+# Loading Directive
+
+
+You may want to block a part of UI and show a spinner for a while; the `LoadingDirective` directive is making this for you. `LoadingDirective` has been exposed by the `@abp/ng.theme.shared` package.
+
+
+## Getting Started
+
+In order to use the `LoadingDirective` in an HTML template, the **`ThemeSharedModule`** should be imported into your module like this:
+
+```js
+// ...
+import { ThemeSharedModule } from '@abp/ng.theme.shared';
+
+@NgModule({
+  //...
+  imports: [..., ThemeSharedModule],
+})
+export class MyFeatureModule {}
+```
+
+
+## Usage
+
+The `LoadingDirective` is easy to use. The directive's selector is **`abpLoading`**. By adding the `abpLoading` attribute to an HTML element , you can activate the `LoadingDirectiveective` for the HTML element when value is true.
+
+See an example usage:
+
+```html
+<div [abpLoading]="true">
+    Lorem ipsum dolor sit, amet consectetur adipisicing elit. Laboriosam commodi quae aspernatur,
+    corporis velit et suscipit id consequuntur amet minima expedita cum reiciendis dolorum
+    cupiditate? Voluptas eaque voluptatum odio deleniti quo vel illum nemo accusamus nulla ratione
+    impedit dolorum expedita necessitatibus fugiat ullam beatae, optio eum cupiditate ducimus
+    architecto.
+  </div>
+```
+
+
+The `abpLoading` attribute has been added to the `<div>` element that containing very long text inside to activate the `LoadingDirective`.
+
+See the result:
+
+![Loading directive result](./images/abp-loading.png)

docs/en/docs-nav.json

@@ -1028,6 +1028,10 @@
                   "text": "Confirmation Popup",
                   "path": "UI/Angular/Confirmation-Service.md"
                 },
+                {
+                  "text": "Loading Directive",
+                  "path": "UI/Angular/Loading-Directive.md"
+                },
                 {
                   "text": "Toast Overlay",
                   "path": "UI/Angular/Toaster-Service.md"