Add runtime/headless doc

Author: Voltstro

docs/articles/toc.yml

@@ -23,6 +23,8 @@
       href: user/javascript.md
     - name: Client Events
       href: user/events.md
+    - name: Runtime Creation
+      href: user/runtime.md
     - name: Player Build
       href: user/player-build.md
 

docs/articles/user/runtime.md

@@ -0,0 +1,16 @@
+# Runtime Creation
+
+The <xref:VoltstroStudios.UnityWebBrowser.Core.WebBrowserClient> can be created manually at runtime without the usage of <xref:VoltstroStudios.UnityWebBrowser.WebBrowserUIBasic> or <xref:VoltstroStudios.UnityWebBrowser.WebBrowserUIFull>.
+
+When instantiating the class, you will need to set all required properties yourself.
+
+> [!NOTE]
+> <xref:VoltstroStudios.UnityWebBrowser.Communication.CommunicationLayer> and <xref:VoltstroStudios.UnityWebBrowser.Core.Engines.Engine> objects are Unity's [ScriptableObject](https://docs.unity3d.com/2021.3/Documentation/Manual/class-ScriptableObject.html). The associated properties on <xref:VoltstroStudios.UnityWebBrowser.Core.WebBrowserClient> must be set to a ScriptableObject instance, or created at runtime through the [`ScriptableObject.CreateInstance()`](https://docs.unity3d.com/2021.3/Documentation/ScriptReference/ScriptableObject.CreateInstance.html) method.
+
+There is a sample script that creates everything including the canvas, the <xref:VoltstroStudios.UnityWebBrowser.Core.WebBrowserClient.engine>, the <xref:VoltstroStudios.UnityWebBrowser.Core.WebBrowserClient.communicationLayer> and the <xref:VoltstroStudios.UnityWebBrowser.Core.WebBrowserClient> instance it self. You can import the script straight into your Unity project via the sample sections of the UWB package, or you can [view the script in GitHub](https://github.com/Voltstro-Studios/UnityWebBrowser/blob/master/src/Packages/UnityWebBrowser/Samples~/Runtime/Scripts/UWBRuntime.cs).
+
+## Headless Mode
+
+<xref:VoltstroStudios.UnityWebBrowser.Core.WebBrowserClient> constructor includes a `headless` parameter. When set to `true`, UWB will run in headless mode.
+
+Headless mode will not create a <xref:VoltstroStudios.UnityWebBrowser.Core.WebBrowserClient.BrowserTexture>, and it will not run UWB's internal pixel data thread. All other methods that the <xref:VoltstroStudios.UnityWebBrowser.Core.WebBrowserClient> has are available.