Add security api page

Author: SerafimArts

Writerside/boson.tree

@@ -42,6 +42,7 @@
             <toc-element topic="bindings-api.md" />
             <toc-element topic="data-api.md" />
             <toc-element topic="web-components-api.md" />
+            <toc-element topic="security-api.md" />
         </toc-element>
         <toc-element topic="events.md" />
     </toc-element>

Writerside/topics/webview/security-api.md

@@ -0,0 +1,32 @@
+# Security API
+
+<show-structure for="chapter" depth="2"/>
+
+This API provides information about 
+[security context](https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts) 
+used to access [other APIs](https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts/features_restricted_to_secure_contexts).
+
+The API is available in the `WebView::$security` property.
+
+```php
+$app = new Boson\Application();
+
+$app->webview->security; // Access to Security API
+```
+
+<note>
+Your context will most likely be <b>secure</b> if you don't use the 
+<code>data:</code> or <code>about:</code> protocol schemes
+</note>
+
+## Current Context
+<secondary-label ref="read-only"/>
+
+To get the current security status you can use the read-only 
+`$isSecureContext` property.
+
+```php
+$isSecure = $app->webview->security->isSecureContext;
+
+echo 'Context is ' . ($isSecure ? 'secure' : 'insecure'); 
+```