Add rawColumn api docs.

Author: yajra

documentation.md

@@ -30,6 +30,7 @@
 	- [Edit Column](/docs/{{package}}/{{version}}/edit-column)
 	- [Remove Column](/docs/{{package}}/{{version}}/remove-column)
 	- [Index Column](/docs/{{package}}/{{version}}/index-column)
+	- [Raw Columns](/docs/{{package}}/{{version}}/raw-columns)
 - Row Editing
 	- [Row Options](/docs/{{package}}/{{version}}/row-options)
 	- [Row ID](/docs/{{package}}/{{version}}/row-options#row-id)

raw-columns.md

@@ -0,0 +1,20 @@
+# Raw Columns
+
+By default, Laravel DataTables protects us from XSS attack by esacping all our outputs.
+In cases where you want to render an html content, please use `rawColumns` api.
+
+
+```php
+use Datatables;
+
+Route::get('user-data', function() {
+	$model = App\User::query();
+
+	return Datatables::eloquent($model)
+				->addColumn('link', '<a href="#">Html Column</a>')
+				->addColumn('action', 'path.to.view')
+				->rawColumns(['link', 'action'])
+				->make(true);
+});
+```
+